Rearranged tests in test_ode.py so that tests that should XFAIL now do
Rearranged tests in test_ode.py so that tests that should XFAIL now do

There are various reasons that tests XFAIL.  See the comments for more
info.  None of them are strictly the fault of dsolve.

Also added trigsimp to checksol.

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

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