Staff activity 1.9

Staff activity v1.9 changes:

Fixed null condition error.

Staff activity v1.8 changes:

Fixed issue with moderated content count.

Staff activity v1.7 changes:

Now using finder for database operations.

Staff activity v1.6 changes:

Updated setup to use schema manager.

Staff activity v1.5 changes:

Fixed issue with User group selection in the Options page. A server error was issued if there wasn't any User group selection in the Options page.

Staff activity v1.4 changes:

Updated for XF v2.1 or newer. Also improved Options page to allow selecting User groups from a menu.

Staff activity v1.3 changes:

In the Staff activity results page, changed Conversations created to Conversation posts created.

Staff activity v1.2 changes:

Added 'Conversations created' column.

Staff activity v1.1 changes:

Added 'Likes received' information.