Fix the failing hydrogen doctest
Fix the failing hydrogen doctest

The problem is, that the laguerre_l() used to return an expanded polynomial,
while after the 1fc30f8 patch, it returns it unexpanded. So we just expand it
in the R_nl() function for now.

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