Merge remote-tracking branch 'remotes/nickv/ticket/10411-2' into develop

# By Joas Schilling
# Via Joas Schilling
* remotes/nickv/ticket/10411-2: (33 commits)
  [ticket/10411] Fix call to function on non-object $db->...()
  [ticket/10411] Remove ajax delete, so the page is refreshed
  [ticket/10411] Update schema file with new table and remove the column
  [ticket/10411] Add unit tests for move() with values >1
  [ticket/10411] Add migrations file for teampage table
  [ticket/10411] Revert database_update.php changes from for easier update
  [ticket/10411] Add maxlength to category name input field
  [ticket/10411] Test for thrown exceptions when group does not exist
  [ticket/10411] Catch exceptions from grouppositions
  [ticket/10411] Throw exceptions instead of using trigger_error()
  [ticket/10411] Add return values to add/delete function
  [ticket/10411] Add return value to move functions
  [ticket/10411] Fix typehinting and change private to protected
  [ticket/10411] Use template loops instead of defining the html in php files
  [ticket/10411] Ensure we only get services that do exist
  [ticket/10411] Add a comment why we left join the group table
  [ticket/10411] Rename template variable CUR_ to CURRENT_
  [ticket/10411] Move globals to the top and use array for cache destroy
  [ticket/10411] Use new ajax callback name row_up/row_down
  [ticket/10411] Fix logic error when editing/creating a group
  ...