Many improvements to pbx-calls.lua:
Many improvements to pbx-calls.lua:

1) Now trimming whitespace from all input before checking validity (of extensions, users, providers).
2) Now building valid outdoing providers and valid users array while rendering page since we're going
   through all providers and users anyway to display the page (saves cycles).
3) Now not displaying internal naming scheme of providers to users, but what they expect (us#erin%fo@host.org).
   Before we used to show us_erin_fo@host_org, and it was ugly and needed explanations.
4) Got rid of some no-longer-needed functions due to improvements mentioned in (2).
5) 



deepak78/new-luci,wongsyrone/luci-1,cshore/luci,kuoruan/luci,bittorf/luci,Wedmer/luci,male-puppies/luci,joaofvieira/luci,cshore-firmware/openwrt-luci,thess/OpenWrt-luci,mumuqz/luci,forward619/luci,hnyman/luci,LuttyYang/luci,tobiaswaldvogel/luci,david-xiao/luci,jorgifumi/luci,thess/OpenWrt-luci,palmettos/cnLuCI,sujeet14108/luci,RedSnake64/openwrt-luci-packages,NeoRaider/luci,urueedi/luci,ollie27/openwrt_luci,sujeet14108/luci,daofeng2015/luci,taiha/luci,nmav/luci,nwf/openwrt-luci,ff94315/luci-1,aircross/OpenWrt-Firefly-LuCI,NeoRaider/luci,cshore/luci,nmav/luci,maxrio/luci981213,artynet/luci,dismantl/luci-0.12,Hostle/openwrt-luci-multi-user,openwrt/luci,male-puppies/luci,obsy/luci,oyido/luci,ff94315/luci-1,Noltari/luci,sujeet14108/luci,keyidadi/luci,aa65535/luci,mumuqz/luci,aircross/OpenWrt-Firefly-LuCI,mumuqz/luci,tobiaswaldvogel/luci,Kyklas/luci-proto-hso,bittorf/luci,lcf258/openwrtcn,bittorf/luci,slayerrensky/luci,nwf/openwrt-luci,urueedi/luci,teslamint/luci,Kyklas/luci-proto-hso,Noltari/luci,fkooman/luci,Hostle/luci,nmav/luci,nwf/openwrt-luci,fkooman/luci,Hostle/luci,MinFu/luci,Hostle/openwrt-luci-multi-user,schidler/ionic-luci,slayerrensky/luci,palmettos/cnLuCI,schidler/ionic-luci,ReclaimYourPrivacy/cloak-luci,schidler/ionic-luci,oyido/luci,Hostle/openwrt-luci-multi-user,harveyhu2012/luci,urueedi/luci,cshore-firmware/openwrt-luci,daofeng2015/luci,bittorf/luci,zhaoxx063/luci,bittorf/luci,maxrio/luci981213,lcf258/openwrtcn,jchuang1977/luci-1,rogerpueyo/luci,cshore/luci,cshore/luci,aa65535/luci,urueedi/luci,taiha/luci,keyidadi/luci,NeoRaider/luci,palmettos/test,joaofvieira/luci,aa65535/luci,forward619/luci,schidler/ionic-luci,taiha/luci,hnyman/luci,opentechinstitute/luci,harveyhu2012/luci,hnyman/luci,jorgifumi/luci,rogerpueyo/luci,981213/luci-1,aa65535/luci,mumuqz/luci,oneru/luci,slayerrensky/luci,daofeng2015/luci,aircross/OpenWrt-Firefly-LuCI,Hostle/luci,Hostle/openwrt-luci-multi-user,ollie27/openwrt_luci,palmettos/test,remakeelectric/luci,lbthomsen/openwrt-luci,obsy/luci,RuiChen1113/luci,dwmw2/luci,oyido/luci,wongsyrone/luci-1,MinFu/luci,florian-shellfire/luci,jlopenwrtluci/luci,ollie27/openwrt_luci,harveyhu2012/luci,zhaoxx063/luci,marcel-sch/luci,db260179/openwrt-bpi-r1-luci,oneru/luci,NeoRaider/luci,bright-things/ionic-luci,obsy/luci,bittorf/luci,sujeet14108/luci,LazyZhu/openwrt-luci-trunk-mod,artynet/luci,daofeng2015/luci,male-puppies/luci,kuoruan/luci,ReclaimYourPrivacy/cloak-luci,MinFu/luci,oneru/luci,LuttyYang/luci,kuoruan/lede-luci,david-xiao/luci,oyido/luci,daofeng2015/luci,Sakura-Winkey/LuCI,joaofvieira/luci,RedSnake64/openwrt-luci-packages,rogerpueyo/luci,fkooman/luci,lbthomsen/openwrt-luci,ollie27/openwrt_luci,male-puppies/luci,Sakura-Winkey/LuCI,bittorf/luci,taiha/luci,kuoruan/lede-luci,kuoruan/lede-luci,cshore-firmware/openwrt-luci,db260179/openwrt-bpi-r1-luci,cappiewu/luci,male-puppies/luci,forward619/luci,nwf/openwrt-luci,remakeelectric/luci,shangjiyu/luci-with-extra,Kyklas/luci-proto-hso,NeoRaider/luci,opentechinstitute/luci,981213/luci-1,daofeng2015/luci,schidler/ionic-luci,ReclaimYourPrivacy/cloak-luci,mumuqz/luci,wongsyrone/luci-1,bright-things/ionic-luci,MinFu/luci,nmav/luci,mumuqz/luci,openwrt-es/openwrt-luci,jlopenwrtluci/luci,zhaoxx063/luci,sujeet14108/luci,palmettos/cnLuCI,NeoRaider/luci,wongsyrone/luci-1,remakeelectric/luci,openwrt/luci,Hostle/openwrt-luci-multi-user,openwrt/luci,LuttyYang/luci,LuttyYang/luci,rogerpueyo/luci,oyido/luci,nwf/openwrt-luci,Hostle/openwrt-luci-multi-user,ff94315/luci-1,dwmw2/luci,kuoruan/luci,palmettos/test,db260179/openwrt-bpi-r1-luci,kuoruan/lede-luci,tcatm/luci,wongsyrone/luci-1,jchuang1977/luci-1,ff94315/luci-1,opentechinstitute/luci,tcatm/luci,palmettos/test,db260179/openwrt-bpi-r1-luci,oyido/luci,bright-things/ionic-luci,thesabbir/luci,forward619/luci,openwrt-es/openwrt-luci,jchuang1977/luci-1,chris5560/openwrt-luci,NeoRaider/luci,ollie27/openwrt_luci,thesabbir/luci,palmettos/test,zhaoxx063/luci,ollie27/openwrt_luci,palmettos/test,cshore/luci,RuiChen1113/luci,cappiewu/luci,opentechinstitute/luci,oneru/luci,tcatm/luci,harveyhu2012/luci,sujeet14108/luci,nmav/luci,sujeet14108/luci,marcel-sch/luci,david-xiao/luci,LuttyYang/luci,Wedmer/luci,openwrt-es/openwrt-luci,artynet/luci,keyidadi/luci,jlopenwrtluci/luci,Hostle/luci,opentechinstitute/luci,dwmw2/luci,wongsyrone/luci-1,artynet/luci,981213/luci-1,hnyman/luci,harveyhu2012/luci,jchuang1977/luci-1,deepak78/new-luci,Kyklas/luci-proto-hso,zhaoxx063/luci,kuoruan/lede-luci,chris5560/openwrt-luci,teslamint/luci,kuoruan/luci,schidler/ionic-luci,jlopenwrtluci/luci,palmettos/cnLuCI,tcatm/luci,palmettos/test,MinFu/luci,urueedi/luci,keyidadi/luci,RedSnake64/openwrt-luci-packages,Kyklas/luci-proto-hso,artynet/luci,shangjiyu/luci-with-extra,teslamint/luci,marcel-sch/luci,tobiaswaldvogel/luci,joaofvieira/luci,Wedmer/luci,LazyZhu/openwrt-luci-trunk-mod,deepak78/new-luci,Hostle/luci,openwrt/luci,urueedi/luci,artynet/luci,zhaoxx063/luci,oneru/luci,tobiaswaldvogel/luci,tcatm/luci,jlopenwrtluci/luci,david-xiao/luci,obsy/luci,artynet/luci,opentechinstitute/luci,cshore-firmware/openwrt-luci,opentechinstitute/luci,daofeng2015/luci,openwrt/luci,david-xiao/luci,male-puppies/luci,981213/luci-1,oyido/luci,981213/luci-1,Sakura-Winkey/LuCI,Wedmer/luci,LazyZhu/openwrt-luci-trunk-mod,fkooman/luci,nwf/openwrt-luci,shangjiyu/luci-with-extra,schidler/ionic-luci,remakeelectric/luci,taiha/luci,aircross/OpenWrt-Firefly-LuCI,chris5560/openwrt-luci,Hostle/luci,deepak78/new-luci,ff94315/luci-1,ReclaimYourPrivacy/cloak-luci,artynet/luci,RedSnake64/openwrt-luci-packages,teslamint/luci,Sakura-Winkey/LuCI,db260179/openwrt-bpi-r1-luci,dismantl/luci-0.12,remakeelectric/luci,teslamint/luci,jlopenwrtluci/luci,florian-shellfire/luci,Noltari/luci,opentechinstitute/luci,jorgifumi/luci,openwrt-es/openwrt-luci,thesabbir/luci,ff94315/luci-1,MinFu/luci,thess/OpenWrt-luci,kuoruan/luci,rogerpueyo/luci,thess/OpenWrt-luci,rogerpueyo/luci,db260179/openwrt-bpi-r1-luci,fkooman/luci,wongsyrone/luci-1,Wedmer/luci,lcf258/openwrtcn,aircross/OpenWrt-Firefly-LuCI,oneru/luci,tcatm/luci,Sakura-Winkey/LuCI,male-puppies/luci,joaofvieira/luci,palmettos/cnLuCI,cappiewu/luci,cappiewu/luci,Sakura-Winkey/LuCI,male-puppies/luci,marcel-sch/luci,nmav/luci,lbthomsen/openwrt-luci,dismantl/luci-0.12,cappiewu/luci,cappiewu/luci,lcf258/openwrtcn,cshore/luci,RedSnake64/openwrt-luci-packages,Sakura-Winkey/LuCI,cshore/luci,Hostle/luci,jchuang1977/luci-1,RuiChen1113/luci,mumuqz/luci,ollie27/openwrt_luci,kuoruan/luci,RuiChen1113/luci,slayerrensky/luci,zhaoxx063/luci,taiha/luci,dismantl/luci-0.12,bright-things/ionic-luci,Kyklas/luci-proto-hso,dwmw2/luci,tobiaswaldvogel/luci,david-xiao/luci,chris5560/openwrt-luci,aircross/OpenWrt-Firefly-LuCI,tcatm/luci,aa65535/luci,sujeet14108/luci,tobiaswaldvogel/luci,jorgifumi/luci,cshore-firmware/openwrt-luci,LuttyYang/luci,wongsyrone/luci-1,florian-shellfire/luci,daofeng2015/luci,harveyhu2012/luci,forward619/luci,cshore/luci,openwrt/luci,keyidadi/luci,shangjiyu/luci-with-extra,deepak78/new-luci,forward619/luci,Wedmer/luci,joaofvieira/luci,lcf258/openwrtcn,db260179/openwrt-bpi-r1-luci,teslamint/luci,bright-things/ionic-luci,NeoRaider/luci,Noltari/luci,cshore-firmware/openwrt-luci,openwrt-es/openwrt-luci,obsy/luci,cappiewu/luci,RuiChen1113/luci,openwrt/luci,bright-things/ionic-luci,RedSnake64/openwrt-luci-packages,Kyklas/luci-proto-hso,marcel-sch/luci,jorgifumi/luci,florian-shellfire/luci,florian-shellfire/luci,MinFu/luci,shangjiyu/luci-with-extra,florian-shellfire/luci,maxrio/luci981213,nmav/luci,ReclaimYourPrivacy/cloak-luci,Noltari/luci,deepak78/new-luci,LazyZhu/openwrt-luci-trunk-mod,jlopenwrtluci/luci,thess/OpenWrt-luci,Sakura-Winkey/LuCI,keyidadi/luci,aircross/OpenWrt-Firefly-LuCI,jlopenwrtluci/luci,RuiChen1113/luci,rogerpueyo/luci,nwf/openwrt-luci,bright-things/ionic-luci,hnyman/luci,cshore-firmware/openwrt-luci,Noltari/luci,lcf258/openwrtcn,palmettos/test,harveyhu2012/luci,oyido/luci,ReclaimYourPrivacy/cloak-luci,keyidadi/luci,Hostle/openwrt-luci-multi-user,Hostle/openwrt-luci-multi-user,thess/OpenWrt-luci,hnyman/luci,dismantl/luci-0.12,rogerpueyo/luci,kuoruan/luci,thess/OpenWrt-luci,RuiChen1113/luci,ff94315/luci-1,joaofvieira/luci,david-xiao/luci,jorgifumi/luci,thesabbir/luci,jorgifumi/luci,dwmw2/luci,fkooman/luci,obsy/luci,Wedmer/luci,schidler/ionic-luci,dismantl/luci-0.12,RuiChen1113/luci,palmettos/cnLuCI,thess/OpenWrt-luci,obsy/luci,slayerrensky/luci,ReclaimYourPrivacy/cloak-luci,chris5560/openwrt-luci,taiha/luci,maxrio/luci981213,tcatm/luci,marcel-sch/luci,kuoruan/luci,marcel-sch/luci,chris5560/openwrt-luci,ollie27/openwrt_luci,981213/luci-1,hnyman/luci,thesabbir/luci,lbthomsen/openwrt-luci,slayerrensky/luci,981213/luci-1,remakeelectric/luci,shangjiyu/luci-with-extra,obsy/luci,dwmw2/luci,joaofvieira/luci,fkooman/luci,hnyman/luci,dwmw2/luci,lbthomsen/openwrt-luci,chris5560/openwrt-luci,jchuang1977/luci-1,mumuqz/luci,aa65535/luci,Noltari/luci,tobiaswaldvogel/luci,urueedi/luci,fkooman/luci,openwrt-es/openwrt-luci,jorgifumi/luci,LuttyYang/luci,LazyZhu/openwrt-luci-trunk-mod,Wedmer/luci,palmettos/cnLuCI,cshore-firmware/openwrt-luci,lbthomsen/openwrt-luci,shangjiyu/luci-with-extra,bittorf/luci,db260179/openwrt-bpi-r1-luci,remakeelectric/luci,cappiewu/luci,teslamint/luci,forward619/luci,kuoruan/lede-luci,Hostle/luci,LuttyYang/luci,kuoruan/lede-luci,maxrio/luci981213,openwrt-es/openwrt-luci,marcel-sch/luci,thesabbir/luci,deepak78/new-luci,zhaoxx063/luci,artynet/luci,Noltari/luci,tobiaswaldvogel/luci,LazyZhu/openwrt-luci-trunk-mod,lcf258/openwrtcn,florian-shellfire/luci,aa65535/luci,openwrt-es/openwrt-luci,thesabbir/luci,jchuang1977/luci-1,chris5560/openwrt-luci,lbthomsen/openwrt-luci,slayerrensky/luci,ReclaimYourPrivacy/cloak-luci,openwrt/luci,dwmw2/luci,lcf258/openwrtcn,nmav/luci,ff94315/luci-1,forward619/luci,teslamint/luci,taiha/luci,dismantl/luci-0.12,oneru/luci,Noltari/luci,nmav/luci,thesabbir/luci,RedSnake64/openwrt-luci-packages,nwf/openwrt-luci,shangjiyu/luci-with-extra,keyidadi/luci,maxrio/luci981213,bright-things/ionic-luci,david-xiao/luci,deepak78/new-luci,lcf258/openwrtcn,lcf258/openwrtcn,florian-shellfire/luci,slayerrensky/luci,jchuang1977/luci-1,aa65535/luci,maxrio/luci981213,LazyZhu/openwrt-luci-trunk-mod,kuoruan/lede-luci,urueedi/luci,palmettos/cnLuCI,remakeelectric/luci,maxrio/luci981213,oneru/luci,lbthomsen/openwrt-luci,LazyZhu/openwrt-luci-trunk-mod,MinFu/luci