DOC: add reference for ndimage.watershed_ift algorithm.
DOC: add reference for ndimage.watershed_ift algorithm.

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