ENH: improve accuracy of distributions.ncx2, add logpdf method.  Closes #1081.
ENH: improve accuracy of distributions.ncx2, add logpdf method.  Closes #1081.

jamestwebber/scipy,Stefan-Endres/scipy,pyramania/scipy,ortylp/scipy,matthewalbani/scipy,gertingold/scipy,chatcannon/scipy,niknow/scipy,piyush0609/scipy,efiring/scipy,pschella/scipy,aman-iitj/scipy,anntzer/scipy,mingwpy/scipy,maciejkula/scipy,minhlongdo/scipy,mortonjt/scipy,nvoron23/scipy,hainm/scipy,gertingold/scipy,argriffing/scipy,dch312/scipy,nvoron23/scipy,jseabold/scipy,WillieMaddox/scipy,jsilter/scipy,giorgiop/scipy,larsmans/scipy,Srisai85/scipy,nonhermitian/scipy,mgaitan/scipy,Srisai85/scipy,behzadnouri/scipy,kleskjr/scipy,chatcannon/scipy,person142/scipy,endolith/scipy,richardotis/scipy,ndchorley/scipy,scipy/scipy,newemailjdm/scipy,mingwpy/scipy,Newman101/scipy,surhudm/scipy,surhudm/scipy,andyfaff/scipy,WarrenWeckesser/scipy,bkendzior/scipy,mgaitan/scipy,hainm/scipy,vberaudi/scipy,sonnyhu/scipy,nvoron23/scipy,haudren/scipy,niknow/scipy,Gillu13/scipy,jor-/scipy,kalvdans/scipy,ogrisel/scipy,aman-iitj/scipy,kleskjr/scipy,befelix/scipy,arokem/scipy,andyfaff/scipy,ilayn/scipy,jjhelmus/scipy,mortada/scipy,fernand/scipy,pschella/scipy,perimosocordiae/scipy,nmayorov/scipy,kalvdans/scipy,sriki18/scipy,mdhaber/scipy,lukauskas/scipy,zerothi/scipy,lukauskas/scipy,mingwpy/scipy,mikebenfield/scipy,scipy/scipy,ales-erjavec/scipy,behzadnouri/scipy,pnedunuri/scipy,jjhelmus/scipy,woodscn/scipy,perimosocordiae/scipy,behzadnouri/scipy,jor-/scipy,teoliphant/scipy,gfyoung/scipy,pschella/scipy,pizzathief/scipy,matthewalbani/scipy,mgaitan/scipy,sargas/scipy,ales-erjavec/scipy,niknow/scipy,endolith/scipy,witcxc/scipy,josephcslater/scipy,jonycgn/scipy,anntzer/scipy,zaxliu/scipy,sauliusl/scipy,chatcannon/scipy,FRidh/scipy,mgaitan/scipy,pbrod/scipy,giorgiop/scipy,woodscn/scipy,lhilt/scipy,maciejkula/scipy,mdhaber/scipy,bkendzior/scipy,anielsen001/scipy,lhilt/scipy,rmcgibbo/scipy,matthew-brett/scipy,person142/scipy,mtrbean/scipy,tylerjereddy/scipy,nonhermitian/scipy,apbard/scipy,e-q/scipy,jsilter/scipy,WarrenWeckesser/scipy,giorgiop/scipy,ortylp/scipy,lukauskas/scipy,andim/scipy,pizzathief/scipy,zerothi/scipy,Srisai85/scipy,maciejkula/scipy,ChanderG/scipy,vanpact/scipy,woodscn/scipy,hainm/scipy,argriffing/scipy,pbrod/scipy,mortonjt/scipy,vhaasteren/scipy,Kamp9/scipy,mtrbean/scipy,aarchiba/scipy,Stefan-Endres/scipy,futurulus/scipy,argriffing/scipy,rmcgibbo/scipy,anielsen001/scipy,jor-/scipy,dominicelse/scipy,Dapid/scipy,mgaitan/scipy,arokem/scipy,vhaasteren/scipy,pyramania/scipy,sonnyhu/scipy,Kamp9/scipy,teoliphant/scipy,fernand/scipy,WillieMaddox/scipy,sargas/scipy,scipy/scipy,ChanderG/scipy,woodscn/scipy,kleskjr/scipy,giorgiop/scipy,Eric89GXL/scipy,futurulus/scipy,cpaulik/scipy,ChanderG/scipy,jonycgn/scipy,ortylp/scipy,rgommers/scipy,mikebenfield/scipy,woodscn/scipy,WillieMaddox/scipy,sauliusl/scipy,perimosocordiae/scipy,Newman101/scipy,cpaulik/scipy,Shaswat27/scipy,minhlongdo/scipy,Gillu13/scipy,vigna/scipy,teoliphant/scipy,jakevdp/scipy,vigna/scipy,raoulbq/scipy,vberaudi/scipy,zerothi/scipy,anntzer/scipy,vberaudi/scipy,behzadnouri/scipy,jakevdp/scipy,Gillu13/scipy,anntzer/scipy,mortada/scipy,pbrod/scipy,zaxliu/scipy,gfyoung/scipy,rgommers/scipy,nvoron23/scipy,mhogg/scipy,ogrisel/scipy,befelix/scipy,mingwpy/scipy,apbard/scipy,Gillu13/scipy,zxsted/scipy,lhilt/scipy,piyush0609/scipy,richardotis/scipy,Newman101/scipy,fredrikw/scipy,nvoron23/scipy,vanpact/scipy,cpaulik/scipy,aeklant/scipy,raoulbq/scipy,felipebetancur/scipy,felipebetancur/scipy,Kamp9/scipy,trankmichael/scipy,ales-erjavec/scipy,jjhelmus/scipy,Eric89GXL/scipy,e-q/scipy,kleskjr/scipy,jonycgn/scipy,person142/scipy,matthewalbani/scipy,jseabold/scipy,WarrenWeckesser/scipy,aman-iitj/scipy,vanpact/scipy,minhlongdo/scipy,aman-iitj/scipy,arokem/scipy,dominicelse/scipy,gef756/scipy,gertingold/scipy,matthewalbani/scipy,nonhermitian/scipy,person142/scipy,maniteja123/scipy,fredrikw/scipy,argriffing/scipy,lukauskas/scipy,futurulus/scipy,rmcgibbo/scipy,jamestwebber/scipy,njwilson23/scipy,gdooper/scipy,larsmans/scipy,pschella/scipy,ndchorley/scipy,efiring/scipy,Newman101/scipy,grlee77/scipy,fernand/scipy,richardotis/scipy,Srisai85/scipy,mingwpy/scipy,endolith/scipy,grlee77/scipy,anntzer/scipy,rmcgibbo/scipy,e-q/scipy,njwilson23/scipy,jseabold/scipy,pnedunuri/scipy,dch312/scipy,tylerjereddy/scipy,maniteja123/scipy,teoliphant/scipy,haudren/scipy,Stefan-Endres/scipy,raoulbq/scipy,mhogg/scipy,trankmichael/scipy,befelix/scipy,Dapid/scipy,sriki18/scipy,jjhelmus/scipy,anielsen001/scipy,raoulbq/scipy,petebachant/scipy,endolith/scipy,Shaswat27/scipy,pschella/scipy,jonycgn/scipy,fernand/scipy,jsilter/scipy,pizzathief/scipy,fredrikw/scipy,woodscn/scipy,argriffing/scipy,efiring/scipy,Shaswat27/scipy,apbard/scipy,josephcslater/scipy,anielsen001/scipy,zxsted/scipy,perimosocordiae/scipy,dominicelse/scipy,mikebenfield/scipy,ales-erjavec/scipy,lhilt/scipy,hainm/scipy,felipebetancur/scipy,rgommers/scipy,bkendzior/scipy,mhogg/scipy,perimosocordiae/scipy,dch312/scipy,kalvdans/scipy,gfyoung/scipy,mdhaber/scipy,richardotis/scipy,nmayorov/scipy,witcxc/scipy,vanpact/scipy,mgaitan/scipy,mhogg/scipy,vanpac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