Fixed bug in Mul.flatten (see sympy-group in topic 'Moving to new core'
Fixed bug in Mul.flatten (see sympy-group in topic 'Moving to new core'

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