Unlink HMS with django's settings:

Unlink HMS with django's settings:
Remove call of modules.init() from hms.py and remove explicit import of settings module from modules.py.
So, now importer module must call hms.modules.init() after import.
To make HMS use django's settings, importer can explicitly add "settings" attribute to modules module and append "settings" to hms.modules.exports before calling hms.modules.init().