newask: Only get the facts for each expression once
newask: Only get the facts for each expression once

This makes things much more efficient. Cached operations are almost 3 times
faster. The first run is faster, though not as much so, because the
known_facts_cnf.rcall(expr) line is still too slow.

emon10005/sympy,mcdaniel67/sympy,Gadal/sympy,souravsingh/sympy,atreyv/sympy,AkademieOlympia/sympy,garvitr/sympy,moble/sympy,skidzo/sympy,lindsayad/sympy,hargup/sympy,yashsharan/sympy,debugger22/sympy,atsao72/sympy,Arafatk/sympy,yashsharan/sympy,Vishluck/sympy,kevalds51/sympy,kaichogami/sympy,Shaswat27/sympy,kevalds51/sympy,aktech/sympy,wyom/sympy,abhiii5459/sympy,moble/sympy,chaffra/sympy,bukzor/sympy,jbbskinny/sympy,madan96/sympy,aktech/sympy,ga7g08/sympy,kevalds51/sympy,Davidjohnwilson/sympy,abloomston/sympy,oliverlee/sympy,drufat/sympy,maniteja123/sympy,VaibhavAgarwalVA/sympy,wanglongqi/sympy,Shaswat27/sympy,yashsharan/sympy,farhaanbukhsh/sympy,abloomston/sympy,abhiii5459/sympy,Titan-C/sympy,bukzor/sympy,toolforger/sympy,Designist/sympy,Davidjohnwilson/sympy,atreyv/sympy,Shaswat27/sympy,abloomston/sympy,saurabhjn76/sympy,ChristinaZografou/sympy,mcdaniel67/sympy,kumarkrishna/sympy,emon10005/sympy,debugger22/sympy,jerli/sympy,Gadal/sympy,madan96/sympy,lindsayad/sympy,kaichogami/sympy,cswiercz/sympy,rahuldan/sympy,grevutiu-gabriel/sympy,drufat/sympy,Curious72/sympy,sahmed95/sympy,Titan-C/sympy,shikil/sympy,chaffra/sympy,maniteja123/sympy,toolforger/sympy,ga7g08/sympy,souravsingh/sympy,rahuldan/sympy,asm666/sympy,farhaanbukhsh/sympy,toolforger/sympy,grevutiu-gabriel/sympy,saurabhjn76/sympy,Designist/sympy,kaushik94/sympy,VaibhavAgarwalVA/sympy,wyom/sympy,grevutiu-gabriel/sympy,rahuldan/sympy,farhaanbukhsh/sympy,pandeyadarsh/sympy,Vishluck/sympy,Arafatk/sympy,kumarkrishna/sympy,atsao72/sympy,mafiya69/sympy,asm666/sympy,maniteja123/sympy,yukoba/sympy,Designist/sympy,postvakje/sympy,abhiii5459/sympy,mafiya69/sympy,drufat/sympy,ahhda/sympy,kaichogami/sympy,MechCoder/sympy,wanglongqi/sympy,MechCoder/sympy,jaimahajan1997/sympy,yukoba/sympy,jbbskinny/sympy,asm666/sympy,garvitr/sympy,kumarkrishna/sympy,ChristinaZografou/sympy,ChristinaZografou/sympy,wanglongqi/sympy,bukzor/sympy,kaushik94/sympy,pandeyadarsh/sympy,hargup/sympy,AkademieOlympia/sympy,atreyv/sympy,kaushik94/sympy,postvakje/sympy,Titan-C/sympy,mcdaniel67/sympy,jerli/sympy,oliverlee/sympy,shikil/sympy,jbbskinny/sympy,sampadsaha5/sympy,iamutkarshtiwari/sympy,debugger22/sympy,skidzo/sympy,aktech/sympy,Vishluck/sympy,shikil/sympy,Gadal/sympy,skidzo/sympy,hargup/sympy,madan96/sympy,Curious72/sympy,cswiercz/sympy,sampadsaha5/sympy,ahhda/sympy,AkademieOlympia/sympy,chaffra/sympy,emon10005/sympy,ga7g08/sympy,MechCoder/sympy,sahmed95/sympy,jaimahajan1997/sympy,cswiercz/sympy,Curious72/sympy,lindsayad/sympy,pandeyadarsh/sympy,iamutkarshtiwari/sympy,iamutkarshtiwari/sympy,Arafatk/sympy,VaibhavAgarwalVA/sympy,Davidjohnwilson/sympy,garvitr/sympy,wyom/sympy,souravsingh/sympy,saurabhjn76/sympy,atsao72/sympy,mafiya69/sympy,jerli/sympy,sampadsaha5/sympy,moble/sympy,sahmed95/sympy,ahhda/sympy,jaimahajan1997/sympy,postvakje/sympy,yukoba/sympy,oliverlee/sympy