Checks for not using tabs in indentation and also improves the line end check.
Checks for not using tabs in indentation and also improves the line end check.

Now we are checking that no line ends either by spaces or tabs and also that
tabs are not used for indentation (they could be used in the middle of the line
-- not sure if there is such a use case though).

drufat/sympy,cccfran/sympy,cswiercz/sympy,wanglongqi/sympy,sahilshekhawat/sympy,abloomston/sympy,moble/sympy,rahuldan/sympy,AkademieOlympia/sympy,sahmed95/sympy,shikil/sympy,atreyv/sympy,abhiii5459/sympy,tovrstra/sympy,Davidjohnwilson/sympy,sampadsaha5/sympy,moble/sympy,pandeyadarsh/sympy,kevalds51/sympy,kaushik94/sympy,ChristinaZografou/sympy,jerli/sympy,shipci/sympy,atreyv/sympy,hrashk/sympy,ChristinaZografou/sympy,moble/sympy,bukzor/sympy,skidzo/sympy,emon10005/sympy,cswiercz/sympy,asm666/sympy,bukzor/sympy,MechCoder/sympy,debugger22/sympy,toolforger/sympy,asm666/sympy,sampadsaha5/sympy,abloomston/sympy,jbbskinny/sympy,Titan-C/sympy,meghana1995/sympy,Shaswat27/sympy,MridulS/sympy,mcdaniel67/sympy,mattpap/sympy-polys,yashsharan/sympy,mafiya69/sympy,ga7g08/sympy,iamutkarshtiwari/sympy,Curious72/sympy,aktech/sympy,maniteja123/sympy,jamesblunt/sympy,shipci/sympy,chaffra/sympy,garvitr/sympy,KevinGoodsell/sympy,vipulroxx/sympy,Vishluck/sympy,sahilshekhawat/sympy,jerli/sympy,toolforger/sympy,beni55/sympy,oliverlee/sympy,toolforger/sympy,ahhda/sympy,kaichogami/sympy,maniteja123/sympy,sunny94/temp,wanglongqi/sympy,hrashk/sympy,Vishluck/sympy,fperez/sympy,VaibhavAgarwalVA/sympy,jaimahajan1997/sympy,atsao72/sympy,postvakje/sympy,shikil/sympy,wyom/sympy,jamesblunt/sympy,oliverlee/sympy,saurabhjn76/sympy,wyom/sympy,oliverlee/sympy,aktech/sympy,iamutkarshtiwari/sympy,amitjamadagni/sympy,sunny94/temp,Sumith1896/sympy,minrk/sympy,Gadal/sympy,jbbskinny/sympy,VaibhavAgarwalVA/sympy,souravsingh/sympy,Davidjohnwilson/sympy,atsao72/sympy,abhiii5459/sympy,liangjiaxing/sympy,atsao72/sympy,Titan-C/sympy,maniteja123/sympy,VaibhavAgarwalVA/sympy,kmacinnis/sympy,lidavidm/sympy,diofant/diofant,kumarkrishna/sympy,jamesblunt/sympy,mafiya69/sympy,meghana1995/sympy,Designist/sympy,kaichogami/sympy,jerli/sympy,abloomston/sympy,bukzor/sympy,AkademieOlympia/sympy,kmacinnis/sympy,garvitr/sympy,sunny94/temp,skidzo/sympy,pbrady/sympy,farhaanbukhsh/sympy,ahhda/sympy,ga7g08/sympy,ryanGT/sympy,garvitr/sympy,minrk/sympy,Designist/sympy,saurabhjn76/sympy,yukoba/sympy,jbaayen/sympy,jbbskinny/sympy,kaushik94/sympy,iamutkarshtiwari/sympy,pandeyadarsh/sympy,hargup/sympy,skirpichev/omg,kmacinnis/sympy,chaffra/sympy,sahilshekhawat/sympy,Curious72/sympy,emon10005/sympy,wyom/sympy,abhiii5459/sympy,Arafatk/sympy,jaimahajan1997/sympy,aktech/sympy,vipulroxx/sympy,AkademieOlympia/sympy,yukoba/sympy,madan96/sympy,ChristinaZografou/sympy,shipci/sympy,dqnykamp/sympy,Designist/sympy,kevalds51/sympy,AunShiLord/sympy,yukoba/sympy,sahmed95/sympy,dqnykamp/sympy,Titan-C/sympy,grevutiu-gabriel/sympy,skidzo/sympy,grevutiu-gabriel/sympy,ahhda/sympy,pbrady/sympy,kevalds51/sympy,beni55/sympy,souravsingh/sympy,Curious72/sympy,AunShiLord/sympy,chaffra/sympy,dqnykamp/sympy,kaichogami/sympy,beni55/sympy,emon10005/sympy,Shaswat27/sympy,rahuldan/sympy,atreyv/sympy,cccfran/sympy,cswiercz/sympy,kumarkrishna/sympy,AunShiLord/sympy,hargup/sympy,lindsayad/sympy,drufat/sympy,farhaanbukhsh/sympy,debugger22/sympy,Mitchkoens/sympy,saurabhjn76/sympy,postvakje/sympy,souravsingh/sympy,lidavidm/sympy,lidavidm/sympy,Vishluck/sympy,sahmed95/sympy,wanglongqi/sympy,lindsayad/sympy,yashsharan/sympy,drufat/sympy,mafiya69/sympy,cccfran/sympy,flacjacket/sympy,Arafatk/sympy,liangjiaxing/sympy,mcdaniel67/sympy,vipulroxx/sympy,pbrady/sympy,shikil/sympy,meghana1995/sympy,lindsayad/sympy,pernici/sympy,hrashk/sympy,kumarkrishna/sympy,MridulS/sympy,madan96/sympy,Davidjohnwilson/sympy,Gadal/sympy,kaushik94/sympy,madan96/sympy,Arafatk/sympy,Sumith1896/sympy,yashsharan/sympy,pandeyadarsh/sympy,grevutiu-gabriel/sympy,Mitchkoens/sympy,mcdaniel67/sympy,MechCoder/sympy,sampadsaha5/sympy,Shaswat27/sympy,MridulS/sympy,Gadal/sympy,hargup/sympy,hazelnusse/sympy-old,Sumith1896/sympy,farhaanbukhsh/sympy,postvakje/sympy,rahuldan/sympy,asm666/sympy,liangjiaxing/sympy,jaimahajan1997/sympy,Mitchkoens/sympy,debugger22/sympy,MechCoder/sympy,hazelnusse/sympy-old,ga7g08/sympy,amitjamadagni/sympy,srjoglekar246/sympy