DOC: Tweak the 1.8.0 release notes.
DOC: Tweak the 1.8.0 release notes.

Add the new nan functions and linear algebra gufuncs to highlights.
Tweak some rst formatting.

kiwifb/numpy,CMartelLML/numpy,WarrenWeckesser/numpy,chiffa/numpy,Linkid/numpy,dato-code/numpy,joferkington/numpy,solarjoe/numpy,brandon-rhodes/numpy,leifdenby/numpy,ahaldane/numpy,chiffa/numpy,larsmans/numpy,MaPePeR/numpy,pyparallel/numpy,moreati/numpy,Eric89GXL/numpy,Eric89GXL/numpy,jorisvandenbossche/numpy,madphysicist/numpy,bmorris3/numpy,ahaldane/numpy,MichaelAquilina/numpy,madphysicist/numpy,maniteja123/numpy,yiakwy/numpy,chiffa/numpy,pbrod/numpy,kirillzhuravlev/numpy,groutr/numpy,pdebuyl/numpy,MaPePeR/numpy,AustereCuriosity/numpy,numpy/numpy,ekalosak/numpy,solarjoe/numpy,ChristopherHogan/numpy,GaZ3ll3/numpy,ChanderG/numpy,rgommers/numpy,jschueller/numpy,utke1/numpy,GrimDerp/numpy,endolith/numpy,abalkin/numpy,endolith/numpy,dwillmer/numpy,ViralLeadership/numpy,sigma-random/numpy,argriffing/numpy,tacaswell/numpy,skymanaditya1/numpy,immerrr/numpy,pyparallel/numpy,Yusa95/numpy,embray/numpy,grlee77/numpy,ChristopherHogan/numpy,Anwesh43/numpy,dato-code/numpy,bmorris3/numpy,BabeNovelty/numpy,hainm/numpy,grlee77/numpy,nguyentu1602/numpy,mattip/numpy,jakirkham/numpy,naritta/numpy,argriffing/numpy,rudimeier/numpy,rhythmsosad/numpy,charris/numpy,mathdd/numpy,jonathanunderwood/numpy,brandon-rhodes/numpy,ChanderG/numpy,mathdd/numpy,ekalosak/numpy,SunghanKim/numpy,sonnyhu/numpy,numpy/numpy,mortada/numpy,githubmlai/numpy,kiwifb/numpy,leifdenby/numpy,pdebuyl/numpy,CMartelLML/numpy,tdsmith/numpy,BMJHayward/numpy,chatcannon/numpy,has2k1/numpy,drasmuss/numpy,dimasad/numpy,ekalosak/numpy,GrimDerp/numpy,Yusa95/numpy,jonathanunderwood/numpy,cowlicks/numpy,ajdawson/numpy,ContinuumIO/numpy,WarrenWeckesser/numpy,mhvk/numpy,GaZ3ll3/numpy,shoyer/numpy,tdsmith/numpy,chatcannon/numpy,ESSS/numpy,githubmlai/numpy,sigma-random/numpy,anntzer/numpy,musically-ut/numpy,ChanderG/numpy,joferkington/numpy,bertrand-l/numpy,yiakwy/numpy,seberg/numpy,ContinuumIO/numpy,jakirkham/numpy,dch312/numpy,madphysicist/numpy,rajathkumarmp/numpy,mindw/numpy,ESSS/numpy,has2k1/numpy,kirillzhuravlev/numpy,immerrr/numpy,NextThought/pypy-numpy,sigma-random/numpy,Anwesh43/numpy,rherault-insa/numpy,hainm/numpy,ahaldane/numpy,githubmlai/numpy,sonnyhu/numpy,skymanaditya1/numpy,Srisai85/numpy,andsor/numpy,MaPePeR/numpy,sigma-random/numpy,jonathanunderwood/numpy,bringingheavendown/numpy,grlee77/numpy,gmcastil/numpy,jschueller/numpy,ChanderG/numpy,pizzathief/numpy,mingwpy/numpy,has2k1/numpy,dwillmer/numpy,mindw/numpy,b-carter/numpy,charris/numpy,BabeNovelty/numpy,moreati/numpy,dimasad/numpy,tynn/numpy,mortada/numpy,dch312/numpy,rhythmsosad/numpy,simongibbons/numpy,mingwpy/numpy,GrimDerp/numpy,b-carter/numpy,empeeu/numpy,pbrod/numpy,CMartelLML/numpy,yiakwy/numpy,mattip/numpy,sonnyhu/numpy,kirillzhuravlev/numpy,larsmans/numpy,ddasilva/numpy,ddasilva/numpy,drasmuss/numpy,ssanderson/numpy,mathdd/numpy,WillieMaddox/numpy,ContinuumIO/numpy,rhythmsosad/numpy,SunghanKim/numpy,embray/numpy,rajathkumarmp/numpy,Anwesh43/numpy,Eric89GXL/numpy,jorisvandenbossche/numpy,brandon-rhodes/numpy,kiwifb/numpy,mhvk/numpy,andsor/numpy,CMartelLML/numpy,naritta/numpy,BMJHayward/numpy,rherault-insa/numpy,nguyentu1602/numpy,jakirkham/numpy,skymanaditya1/numpy,nbeaver/numpy,KaelChen/numpy,solarjoe/numpy,pbrod/numpy,rajathkumarmp/numpy,dwillmer/numpy,GrimDerp/numpy,naritta/numpy,gfyoung/numpy,brandon-rhodes/numpy,charris/numpy,trankmichael/numpy,ddasilva/numpy,rherault-insa/numpy,SiccarPoint/numpy,mindw/numpy,stuarteberg/numpy,seberg/numpy,MSeifert04/numpy,rmcgibbo/numpy,ViralLeadership/numpy,njase/numpy,madphysicist/numpy,tynn/numpy,stuarteberg/numpy,mindw/numpy,WarrenWeckesser/numpy,musically-ut/numpy,mortada/numpy,tdsmith/numpy,groutr/numpy,yiakwy/numpy,grlee77/numpy,dimasad/numpy,ssanderson/numpy,naritta/numpy,tacaswell/numpy,musically-ut/numpy,SunghanKim/numpy,MSeifert04/numpy,GaZ3ll3/numpy,sinhrks/numpy,Dapid/numpy,KaelChen/numpy,jorisvandenbossche/numpy,mwiebe/numpy,pbrod/numpy,abalkin/numpy,numpy/numpy,njase/numpy,Linkid/numpy,ajdawson/numpy,SiccarPoint/numpy,groutr/numpy,jankoslavic/numpy,pdebuyl/numpy,embray/numpy,pbrod/numpy,cowlicks/numpy,MichaelAquilina/numpy,rudimeier/numpy,larsmans/numpy,ChristopherHogan/numpy,cjermain/numpy,utke1/numpy,empeeu/numpy,behzadnouri/numpy,anntzer/numpy,numpy/numpy,larsmans/numpy,andsor/numpy,cowlicks/numpy,mhvk/numpy,mwiebe/numpy,ekalosak/numpy,pizzathief/numpy,bmorris3/numpy,embray/numpy,njase/numpy,nbeaver/numpy,AustereCuriosity/numpy,Srisai85/numpy,rgommers/numpy,endolith/numpy,MichaelAquilina/numpy,bertrand-l/numpy,ssanderson/numpy,sinhrks/numpy,embray/numpy,Anwesh43/numpy,simongibbons/numpy,Yusa95/numpy,ChristopherHogan/numpy,SiccarPoint/numpy,immerrr/numpy,mhvk/numpy,MaPePeR/numpy,gmcastil/numpy,Linkid/numpy,utke1/numpy,WarrenWeckesser/numpy,joferkington/numpy,dato-code/numpy,jakirkham/numpy,Eric89GXL/numpy,argriffing/numpy,pyparallel/numpy,pdebuyl/numpy,trankmichael/numpy,endolith/numpy,dwillmer/numpy,rajathkumarmp/numpy,Dapid/numpy,jschueller/numpy,andsor/numpy,skwbc/numpy,ajdawson/numpy,grlee77/numpy,pizzathief/numpy,jankoslavic/numpy,ViralLeadership/numpy,trankmichael/numpy,jakirkham/numpy,jorisvandenbossche/numpy,behzadnouri/numpy,mortada/numpy,skwbc/numpy,Srisai85/numpy,WillieMaddox/numpy,SiccarPoint/numpy,musically-ut/numpy,rudimeier/numpy,BMJHayward/numpy,anntzer/numpy,cjermain/numpy,MSeifert04/numpy,empeeu/numpy,kirillzhuravlev/numpy,mhvk/numpy,immerrr/numpy,dimasad/numpy,pizzathief/numpy,jorisvandenbossche/numpy,mattip/numpy,rgommers/numpy,felipebetancur/numpy,rmcgibbo/numpy,sinhrks/numpy,MSeifert04/numpy,simongibbons/numpy,sinhrks/numpy,shoyer/numpy,rmcgibbo/numpy,stuarteberg/numpy,sonnyhu/numpy,seberg/numpy,maniteja123/numpy,cowlicks/numpy,shoyer/numpy,hainm/numpy,SunghanKim/numpy,has2k1/numpy,moreati/numpy,GaZ3ll3/numpy,rudimeier/numpy,cjermain/numpy,simongibbons/numpy,gfyoung/numpy,chatcannon/numpy,joferkington/numpy,rgommers/numpy,anntzer/numpy,BabeNovelty/numpy,dch312/numpy,charris/numpy,madphysicist/numpy,hainm/numpy,mathdd/numpy,behzadnouri/numpy,drasmuss/numpy,empeeu/numpy,NextThought/pypy-numpy,felipebetancur/numpy,mingwpy/numpy,shoyer/numpy,tynn/numpy,jankoslavic/numpy,KaelChen/numpy,ajdawson/numpy,seberg/numpy,tacaswell/numpy,pizzathief/numpy,NextThought/pypy-numpy,ahaldane/numpy,ahaldane/numpy,felipebetancur/numpy,nbeaver/numpy,nguyentu1602/numpy,felipebetancur/numpy,jankoslavic/numpy,AustereCuriosity/numpy,simongibbons/numpy,nguyentu1602/numpy,WillieMaddox/numpy,leifdenby/numpy,Yusa95/numpy,dato-code/numpy,BMJHayward/numpy,BabeNovelty/numpy,MichaelAquilina/numpy,Dapid/numpy,gmcastil/numpy,dch312/numpy,jschueller/numpy,MSeifert04/numpy,KaelChen/numpy,githubmlai/numpy,trankmichael/numpy,skwbc/numpy,gfyoung/numpy,stuarteberg/numpy,skymanaditya1/numpy,mingwpy/numpy,rmcgibbo/numpy,cjermain/numpy,NextThought/pypy-numpy,mwiebe/numpy,tdsmith/numpy,b-carter/numpy,bmorris3/numpy,WarrenWeckesser/numpy,Srisai85/numpy,rhythmsosad/numpy,bringingheavendown/numpy,shoyer/numpy,mattip/numpy,ESSS/numpy,abalkin/numpy,Linkid/numpy,bertrand-l/numpy,bringingheavendown/numpy,maniteja123/numpy