Notify the administrators when one of the installed licensed applications has a new version available

[mflorea]

This should be done only if automatic upgrades are turned off for that application or globally. There should also be a configuration option to disable these notifications (e.g. put a checkbox on the Licenses administration section).

The notification message could indicate that in order to disable these notifications you need to:

• either use the corresponding configuration
• or enable automatic upgrades, see Allow an administrator to enable / disable application auto upgrades globally #109

[oanalavinia]

• Added a scheduler job that does a check for new versions available and sends a notification (one per application/wiki/version); this job is triggered once a week since usually upgrades are not done more frequently
• The notification is sent to those that have these notifications (New extension version available) enabled and the System filter disabled, since the notification is send by superadmin user;
• Notifications for a specific extension can be disabled by enabling automatic upgrades for it

The notification:

The notifications settings: