Updates test_matrices.py with tests of columnspace.
Updates test_matrices.py with tests of columnspace.

Updated the necessary tests in test_matrices.py to test the
implementation.Also added additional tests of rank-nullity theorem.
Import of solvers was necessary in test_matrices.py

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