- Show filter for application global categories
r38832: Default owner to same as parent category when adding a child category
r38891: Fix missing parent category when adding a child when parent has acl
r38939: Apply no_acl_check to global categories too
- from user perspectiv they are global cat like the existing ones
(also comming in two flavors: global or for a certain app)
- admins can select to limit a global cat when they create it
--> all members of a given group have the cat as a global one
==> This does a silent modification of the categories table:
global cats get changed from cat_owner=-1 to cat_owner=0 !!!