REPL6: Cache history-file
REPL6: Cache history-file

This way, we're not making a bunch of redundant calls to mkdir(),
not to mention potentially warning the user over and over if
something's wrong

raydiak/rakudo,sjn/rakudo,sjn/rakudo,Gnouc/rakudo,rakudo/rakudo,azawawi/rakudo,tbrowder/rakudo,labster/rakudo,MasterDuke17/rakudo,softmoth/rakudo,awwaiid/rakudo,salortiz/rakudo,nbrown/rakudo,rakudo/rakudo,softmoth/rakudo,Gnouc/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,b2gills/rakudo,usev6/rakudo,raydiak/rakudo,zostay/rakudo,tony-o/rakudo,tbrowder/rakudo,nbrown/rakudo,softmoth/rakudo,jonathanstowe/rakudo,tony-o/rakudo,samcv/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,samcv/rakudo,MasterDuke17/rakudo,nbrown/rakudo,tbrowder/rakudo,ab5tract/rakudo,b2gills/rakudo,b2gills/rakudo,tony-o/rakudo,samcv/rakudo,lucasbuchala/rakudo,nbrown/rakudo,usev6/rakudo,samcv/rakudo,b2gills/rakudo,Gnouc/rakudo,sjn/rakudo,rakudo/rakudo,MasterDuke17/rakudo,zostay/rakudo,Gnouc/rakudo,tony-o/rakudo,softmoth/rakudo,tbrowder/rakudo,awwaiid/rakudo,azawawi/rakudo,nbrown/rakudo,awwaiid/rakudo,tbrowder/rakudo,labster/rakudo,usev6/rakudo,raydiak/rakudo,ab5tract/rakudo,MasterDuke17/rakudo,rakudo/rakudo,rakudo/rakudo,lucasbuchala/rakudo,zostay/rakudo,azawawi/rakudo,lucasbuchala/rakudo,ab5tract/rakudo,salortiz/rakudo,sjn/rakudo,labster/rakudo,salortiz/rakudo,MasterDuke17/rakudo,labster/rakudo,tony-o/rakudo,samcv/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,nbrown/rakudo,softmoth/rakudo,usev6/rakudo,azawawi/rakudo,awwaiid/rakudo,labster/rakudo,jonathanstowe/rakudo,labster/rakudo,salortiz/rakudo,azawawi/rakudo,zostay/rakudo,tony-o/rakudo,ab5tract/rakudo,rakudo/rakudo,jonathanstowe/rakudo,b2gills/rakudo,ab5tract/rakudo,jonathanstowe/rakudo,raydiak/rakudo,usev6/rakudo,salortiz/rakudo,sjn/rakudo,salortiz/rakudo