fixed bug in TensAdd.__new__; factored a function from _contract; eliminated the option `onlydelta` from _contract
fixed bug in TensAdd.__new__; factored a function from _contract;
eliminated the option `onlydelta` from _contract

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