Simplify code in FixedBosonicBasis._build_particle_locations and use eval()
Simplify code in FixedBosonicBasis._build_particle_locations and use eval()

Using eval() instead of an exec statement allows this code to be
compatible with Python3.*.

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