806: Implement hyper.rewrite(Sum)
806: Implement hyper.rewrite(Sum)

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