Remove orphaned routine create_mask from initial MaskedColumn implementation
Remove orphaned routine create_mask from initial MaskedColumn implementation

aleksandr-bakanov/astropy,AustereCuriosity/astropy,bsipocz/astropy,lpsinger/astropy,joergdietrich/astropy,aleksandr-bakanov/astropy,kelle/astropy,joergdietrich/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,tbabej/astropy,astropy/astropy,joergdietrich/astropy,saimn/astropy,mhvk/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,tbabej/astropy,kelle/astropy,funbaker/astropy,saimn/astropy,DougBurke/astropy,funbaker/astropy,AustereCuriosity/astropy,tbabej/astropy,astropy/astropy,saimn/astropy,MSeifert04/astropy,lpsinger/astropy,bsipocz/astropy,DougBurke/astropy,saimn/astropy,bsipocz/astropy,stargaser/astropy,StuartLittlefair/astropy,mhvk/astropy,bsipocz/astropy,larrybradley/astropy,astropy/astropy,funbaker/astropy,pllim/astropy,DougBurke/astropy,kelle/astropy,joergdietrich/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,funbaker/astropy,pllim/astropy,mhvk/astropy,StuartLittlefair/astropy,saimn/astropy,larrybradley/astropy,stargaser/astropy,kelle/astropy,dhomeier/astropy,MSeifert04/astropy,dhomeier/astropy,tbabej/astropy,AustereCuriosity/astropy,tbabej/astropy,DougBurke/astropy,stargaser/astropy,lpsinger/astropy,pllim/astropy,StuartLittlefair/astropy,larrybradley/astropy,stargaser/astropy,pllim/astropy,larrybradley/astropy,MSeifert04/astropy,joergdietrich/astropy,astropy/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,dhomeier/astropy,mhvk/astropy,dhomeier/astropy,mhvk/astropy,StuartLittlefair/astropy,lpsinger/astropy,larrybradley/astropy,kelle/astropy,MSeifert04/astropy