IrcAdmin:
* have sub_unload_module() call the module's shutdown() before deleting stuff
* sub_unload_module() needs to delete the sys.modules entry too
* slightly more verbose output in sub_unload_module()
* sub_reload_module() now does a self.sub_unload_module() + self.sub_load_module()
Module:
* remove reload() --- modules must now safely handle shutdown