factored multinomial_coefficients using _bmpnl_calc and _dcalc
factored multinomial_coefficients using _bmpnl_calc and _dcalc

merged from branch mc1 by smichr

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