Add is_qualified_id tool with tests
Add split_id tool with tests
Adding extra whitespace
Add possibly_qualify_id
Test for: Don't assign a different hive than the one it already has
Clarify that it's a-okay to use possibly_qualify_id to determine
whether to declare an actor local.
Don't freak out if actor id is None.
Fully qualify actor ids when sending a message and creating an actor.