admin: force to select category when adding new content.

(cherry picked from commit ff75c4611a47ca450105f2ec33d8def0cd286ca7)

Conflicts:
	modules/mod_admin/templates/_action_dialog_new_rsc_tab.tpl
menu: edge menu sorter has a problem with sorting nested collections. Disable sorting for now.

(cherry picked from commit d7efdd2325b16c99e25cc5f8472c502ad23f6979)

Conflicts:
	modules/mod_menu/templates/_admin_menu_menu_view.collection.tpl

(cherry picked from commit 2070ea6564fd0995ad8f22a5aa79fb82b29f03d6)
core: module start/stop progress messages are now debug level.