To improve the usability of the backend, filters should be provided where it makes
sense, especially where it is likely to have more records.

- FE Groups: Subgroup selection
- FE User: Group selection
- BE User: Group selection

Resolves: #66621
Releases: master
Change-Id: I483c22487f89f79f313bd72e0bb6fce49efab3fa
Reviewed-on: http://review.typo3.org/38982


Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>