add get_body_barycentric_posvel to __all__ in coordinates/solar_system
add get_body_barycentric_posvel to __all__ in coordinates/solar_system

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