Comment 21 for bug 836707

This is the final patch, I guess.

Changes to the previous ones:
* implemented several annotations by vcap und avb
* katze_array_update_item() → midori_bookmarks_update_item_db() in ./panels/midori-bookmarks.c|h
* use of katze_item_get_meta_integer() instead of katze_item_get_id() (_get_id() dropped)
* renamed “parent” to “parentid” when it is no KatzeItem
* Im- and export tested