Doctests added to refine_abs, refine_Pow and refine_exp
Doctests added to refine_abs, refine_Pow and refine_exp

Signed-off-by: Ondrej Certik <b816faa87b7d35274d2e545c5be11ed4376f3ccf@certik.cz>

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