Minor naming fix "notify_deps" -> "notify_services"
Enhancements to the Licenses table.

* Add a 'comment' field (for users to record metadata)
* Add validation for max comment length
* Change the column name (encoded_string -> encoded_license, more specific)
Add a controller to allow license configuration.

Supports:
* listing all licenses
* show single license
* add new license
* delete license

Editing licenses is NYI (likely customer specific).
Fixes to the UsersController

Specifically, fix the code to update and delete a user.
Add endpoint to delete a license.

(for real)
Fix code quality errors.
Fix code quality check for the FlightDeck Communicator menu.