Add tests of copying and slicing grouped tables
Add tests of copying and slicing grouped tables

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