Add additional test for KanesMethod.
Add additional test for KanesMethod.

Add an additional test for KanesMethod that checks if the calculated
generalized inertia forces are equivalent whether the inertia for rigid
bodies is set about the mass center or an arbitraty point.

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