Package app update:

- added models managers,
- added tests for package actions
- added package instance user workflow
- added zip unpacking into package instance / package source

scratch.py

@@ -8,6 +8,7 @@
 submit_path = pkg_path / '1' / 'prog' / 'solution.cpp'
 
 master = BrokerMaster(DB_STRING, SUBMITS_DIR, APP_SETTINGS['delete_records'])
+master.start()
 master.connection.truncate_db()
 
 master.new_submit(