For completeness, add a dummy load_package() method to RHooks.  It should never be called, so this isn't really needed, but this signifies that rexec now supports packages -- because ihooks does.
For completeness, add a dummy load_package() method to RHooks.  It
should never be called, so this isn't really needed, but this
signifies that rexec now supports packages -- because ihooks does.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator