simplify: try harder to simplify noncommutative expressions.
simplify: try harder to simplify noncommutative expressions.

Previously a number of simplification routines (e.g. trigsimp) were
not even attempted when given a noncommutative expression. Although
cancel() still doesn't support nc terms, the other simplification
routines have been fixed in that regard, so let's not skip them.

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