Add high(est) config level for application specific config files

Some tools use an extra level to maintain an application specific config files on top of the normal ones. Revision 16adc9fade52b49e2bc13cb52407cc0025a93c8b broke this.

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Merge pull request #1645 from csware/config_level_app

Add high(est) config level for application specific config files