special/cephes/hyp2f1: improve accuracy for |a|, |b| > |c| by using recurrence relations
special/cephes/hyp2f1: improve accuracy for |a|, |b| > |c| by using recurrence relations

The hypergeometric series may become highly alternating when |a| or |b| >> |c|
and some of the quantities involved is negative. This can be worked
around by using hypergeometric recurrence relations to reduce the
magnitude of |a| closer to that of |c|.

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