Cleaning up qbasic.
Cleaning up qbasic.

* New docstrings and comments.
* Renamed QuantumExpr->QExpr.

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