further refactoring of csr/csc constructors
further refactoring of csr/csc constructors

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