Ability to assign groups.
To assign group, user must have a right to send a message to that group.
In addition, 2 jobs were introduced, - AssignNotification and UnassignNotification to inform interested users in the background about the new assignment.
* FEATURE: Users can override reminders frequency
* Changes:
- Avoid creating a user custom field when the used didn't override the frequency
- Sanitize frequency value using coercion
- Minor fixes
* Sanitize query and user query single
* FEATURE: Remind users of assigned tasks.
* User an user custom field instead of adding a new column
* Improve tests. fix assigns count and display oldest assigned topics correctly. Do not remind about recently assigned tasks