Fixed some goofs in 'alias_options'. Error message tweak in Command.set_option(). Added Command.get_peer_option(). Added Command.move_file() wrapper.
Fixed some goofs in 'alias_options'.
Error message tweak in Command.set_option().
Added Command.get_peer_option().
Added Command.move_file() wrapper.

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