replace subs with xreplace in frv integrate
replace subs with xreplace in frv integrate

Subs wasn't working well previously.  I'm not certain why.

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