editing fixes nddata/bitmask
editing fixes nddata/bitmask

astropy/astropy,mhvk/astropy,larrybradley/astropy,mhvk/astropy,larrybradley/astropy,dhomeier/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,MSeifert04/astropy,astropy/astropy,stargaser/astropy,dhomeier/astropy,dhomeier/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,astropy/astropy,larrybradley/astropy,stargaser/astropy,MSeifert04/astropy,saimn/astropy,mhvk/astropy,pllim/astropy,stargaser/astropy,StuartLittlefair/astropy,pllim/astropy,mhvk/astropy,saimn/astropy,MSeifert04/astropy,lpsinger/astropy,astropy/astropy,StuartLittlefair/astropy,larrybradley/astropy,pllim/astropy,stargaser/astropy,lpsinger/astropy,pllim/astropy,saimn/astropy,lpsinger/astropy,lpsinger/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,saimn/astropy,dhomeier/astropy,mhvk/astropy,saimn/astropy,astropy/astropy