Remove SQLHelper module #CLEANUP

... which seems not to be used anymore
Remove bypass login in development mode #CLEANUP

... not used anymore
Remove admin/setup_controller #CLEANUP

There is no route hitting this controller.
Move LDAP related methods into LdapHelper module #CLEANUP
Remove development_helper and "minimal metadata"  #CLEANUP

minimal metadata is not used since ages
Move lib/exiftool to app/lib/exiftool  #REFACTOR #CLEANUP

since it is used during runtime
Removed deprecated DBHelper methods #CLEANUP
Try to use DBHelper.load-data with cucumber