Improve, slightly. coverage of core/relational.py
Improve, slightly. coverage of core/relational.py

Basically, make sure to try all combinations of the Relational.rel_op.

Also include fuzz testing of the new speed-improved
ValidRelationOperator.

There are now only two lines not covered by testing.

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