Move AssumeMixin._what_known_about() to PropertyManager.ask()
Move AssumeMixin._what_known_about() to PropertyManager.ask()

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