DOC: Document changes in npymath library.
DOC: Document changes in npymath library.

Document the increased use of the system library for C99 complex
functions and the addition of improved fallback functions for

* npy_ctan,
* npy_cacos, npy_casin, npy_catan
* npy_ccosh, npy_csinh, npy_ctanh,
* npy_cacosh, npy_casinh, npy_catanh

rgommers/numpy,pizzathief/numpy,chiffa/numpy,jonathanunderwood/numpy,behzadnouri/numpy,BMJHayward/numpy,njase/numpy,simongibbons/numpy,gfyoung/numpy,rudimeier/numpy,sonnyhu/numpy,pdebuyl/numpy,Anwesh43/numpy,SunghanKim/numpy,mindw/numpy,b-carter/numpy,ESSS/numpy,MaPePeR/numpy,ajdawson/numpy,mhvk/numpy,pdebuyl/numpy,kirillzhuravlev/numpy,mortada/numpy,githubmlai/numpy,charris/numpy,skymanaditya1/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,GrimDerp/numpy,Eric89GXL/numpy,mattip/numpy,gmcastil/numpy,musically-ut/numpy,rmcgibbo/numpy,charris/numpy,MichaelAquilina/numpy,Yusa95/numpy,groutr/numpy,jschueller/numpy,argriffing/numpy,skwbc/numpy,grlee77/numpy,pbrod/numpy,jschueller/numpy,mattip/numpy,MSeifert04/numpy,abalkin/numpy,rajathkumarmp/numpy,ahaldane/numpy,BabeNovelty/numpy,chiffa/numpy,WarrenWeckesser/numpy,mindw/numpy,MSeifert04/numpy,ESSS/numpy,has2k1/numpy,Linkid/numpy,simongibbons/numpy,sigma-random/numpy,madphysicist/numpy,numpy/numpy,kirillzhuravlev/numpy,behzadnouri/numpy,GaZ3ll3/numpy,ViralLeadership/numpy,SiccarPoint/numpy,jorisvandenbossche/numpy,tdsmith/numpy,cowlicks/numpy,ContinuumIO/numpy,empeeu/numpy,mattip/numpy,anntzer/numpy,abalkin/numpy,tynn/numpy,charris/numpy,bringingheavendown/numpy,tacaswell/numpy,moreati/numpy,Anwesh43/numpy,naritta/numpy,cowlicks/numpy,bmorris3/numpy,seberg/numpy,simongibbons/numpy,dimasad/numpy,cowlicks/numpy,pyparallel/numpy,Eric89GXL/numpy,utke1/numpy,ViralLeadership/numpy,yiakwy/numpy,sigma-random/numpy,nguyentu1602/numpy,cowlicks/numpy,chatcannon/numpy,grlee77/numpy,tdsmith/numpy,SiccarPoint/numpy,mhvk/numpy,mathdd/numpy,musically-ut/numpy,jakirkham/numpy,pbrod/numpy,dimasad/numpy,pyparallel/numpy,sonnyhu/numpy,ChanderG/numpy,rherault-insa/numpy,kirillzhuravlev/numpy,Dapid/numpy,b-carter/numpy,utke1/numpy,grlee77/numpy,mathdd/numpy,jorisvandenbossche/numpy,gfyoung/numpy,cjermain/numpy,bringingheavendown/numpy,hainm/numpy,pbrod/numpy,pbrod/numpy,Srisai85/numpy,ahaldane/numpy,argriffing/numpy,naritta/numpy,rajathkumarmp/numpy,leifdenby/numpy,naritta/numpy,bmorris3/numpy,mortada/numpy,CMartelLML/numpy,KaelChen/numpy,githubmlai/numpy,kiwifb/numpy,jonathanunderwood/numpy,BabeNovelty/numpy,groutr/numpy,ekalosak/numpy,kiwifb/numpy,MaPePeR/numpy,dwillmer/numpy,ssanderson/numpy,WarrenWeckesser/numpy,pdebuyl/numpy,githubmlai/numpy,pyparallel/numpy,mwiebe/numpy,dato-code/numpy,skymanaditya1/numpy,sinhrks/numpy,githubmlai/numpy,KaelChen/numpy,kirillzhuravlev/numpy,shoyer/numpy,trankmichael/numpy,yiakwy/numpy,stuarteberg/numpy,hainm/numpy,simongibbons/numpy,cjermain/numpy,Eric89GXL/numpy,ddasilva/numpy,felipebetancur/numpy,mingwpy/numpy,rudimeier/numpy,MaPePeR/numpy,rmcgibbo/numpy,skwbc/numpy,mingwpy/numpy,WarrenWeckesser/numpy,rajathkumarmp/numpy,nbeaver/numpy,musically-ut/numpy,endolith/numpy,ekalosak/numpy,mathdd/numpy,Yusa95/numpy,cjermain/numpy,ChanderG/numpy,ssanderson/numpy,sonnyhu/numpy,maniteja123/numpy,drasmuss/numpy,GrimDerp/numpy,WarrenWeckesser/numpy,mhvk/numpy,bertrand-l/numpy,has2k1/numpy,bertrand-l/numpy,joferkington/numpy,GrimDerp/numpy,MichaelAquilina/numpy,moreati/numpy,mathdd/numpy,SiccarPoint/numpy,madphysicist/numpy,Linkid/numpy,seberg/numpy,tacaswell/numpy,gmcastil/numpy,bmorris3/numpy,anntzer/numpy,BabeNovelty/numpy,MichaelAquilina/numpy,felipebetancur/numpy,jankoslavic/numpy,joferkington/numpy,hainm/numpy,seberg/numpy,shoyer/numpy,mortada/numpy,MichaelAquilina/numpy,nbeaver/numpy,rudimeier/numpy,ddasilva/numpy,naritta/numpy,grlee77/numpy,pizzathief/numpy,sonnyhu/numpy,rhythmsosad/numpy,madphysicist/numpy,AustereCuriosity/numpy,bertrand-l/numpy,skymanaditya1/numpy,MSeifert04/numpy,stuarteberg/numpy,dwillmer/numpy,KaelChen/numpy,Anwesh43/numpy,pizzathief/numpy,maniteja123/numpy,jankoslavic/numpy,rhythmsosad/numpy,mortada/numpy,mindw/numpy,Srisai85/numpy,ajdawson/numpy,kiwifb/numpy,mingwpy/numpy,njase/numpy,pdebuyl/numpy,chiffa/numpy,rgommers/numpy,sinhrks/numpy,jschueller/numpy,ahaldane/numpy,mattip/numpy,rajathkumarmp/numpy,simongibbons/numpy,hainm/numpy,mwiebe/numpy,BabeNovelty/numpy,jorisvandenbossche/numpy,utke1/numpy,GaZ3ll3/numpy,GrimDerp/numpy,charris/numpy,Srisai85/numpy,ChristopherHogan/numpy,rudimeier/numpy,behzadnouri/numpy,Anwesh43/numpy,empeeu/numpy,pizzathief/numpy,trankmichael/numpy,leifdenby/numpy,trankmichael/numpy,numpy/numpy,rherault-insa/numpy,stuarteberg/numpy,AustereCuriosity/numpy,dato-code/numpy,jonathanunderwood/numpy,madphysicist/numpy,dimasad/numpy,nbeaver/numpy,ViralLeadership/numpy,pizzathief/numpy,shoyer/numpy,has2k1/numpy,chatcannon/numpy,empeeu/numpy,joferkington/numpy,sinhrks/numpy,Linkid/numpy,tacaswell/numpy,Dapid/numpy,GaZ3ll3/numpy,bmorris3/numpy,MaPePeR/numpy,shoyer/numpy,tdsmith/numpy,Yusa95/numpy,WillieMaddox/numpy,sinhrks/numpy,jakirkham/numpy,ddasilva/numpy,numpy/numpy,CMartelLML/numpy,nguyentu1602/numpy,mingwpy/numpy,solarjoe/numpy,felipebetancur/numpy,njase/numpy,felipebetancur/numpy,ssanderson/numpy,solarjoe/numpy,rgommers/numpy,ContinuumIO/numpy,musically-ut/numpy,KaelChen/numpy,mhvk/numpy,abalkin/numpy,solarjoe/numpy,numpy/numpy,BMJHayward/numpy,AustereCuriosity/numpy,SunghanKim/numpy,madphysicist/numpy,mwiebe/numpy,rmcgibbo/numpy,leifdenby/numpy,ChristopherHogan/numpy,anntzer/numpy,rhythmsosad/numpy,chatcannon/numpy,tynn/numpy,Eric89GXL/numpy,mhvk/numpy,sigma-random/numpy,rhythmsosad/numpy,stuarteberg/numpy,endolith/numpy,ekalosak/numpy,WillieMaddox/numpy,jakirkham/numpy,SiccarPoint/numpy,ajdawson/numpy,jankoslavic/numpy,nguyentu1602/numpy,skymanaditya1/numpy,nguyentu1602/numpy,jorisvandenbossche/numpy,groutr/numpy,ChristopherHogan/numpy,Yusa95/numpy,yiakwy/numpy,BMJHayward/numpy,rherault-insa/numpy,anntzer/numpy,Linkid/numpy,shoyer/numpy,MSeifert04/numpy,ahaldane/numpy,argriffing/numpy,gfyoung/numpy,GaZ3ll3/numpy,sigma-random/numpy,ChanderG/numpy,ajdawson/numpy,pbrod/numpy,ekalosak/numpy,jankoslavic/numpy,bringingheavendown/numpy,moreati/numpy,rmcgibbo/numpy,cjermain/numpy,BMJHayward/numpy,endolith/numpy,CMartelLML/numpy,endolith/numpy,drasmuss/numpy,WillieMaddox/numpy,dimasad/numpy,tdsmith/numpy,jschueller/numpy,MSeifert04/numpy,grlee77/numpy,mindw/numpy,trankmichael/numpy,dwillmer/numpy,yiakwy/numpy,SunghanKim/numpy,ESSS/numpy,drasmuss/numpy,jakirkham/numpy,jakirkham/numpy,gmcastil/numpy,skwbc/numpy,empeeu/numpy,has2k1/numpy,Srisai85/numpy,ChristopherHogan/numpy,dato-code/numpy,ContinuumIO/numpy,b-carter/numpy,dato-code/numpy,SunghanKim/numpy,tynn/numpy,joferkington/numpy,ChanderG/numpy,Dapid/numpy,CMartelLML/numpy,rgommers/numpy,dwillmer/numpy,ahaldane/numpy,maniteja123/numpy,seberg/numpy