new : maintenance screen in administration. There you can update
categories informations (number of images, date of the last added
element), update images informations (path, average rate), purge obsolete
sessions, purge history.
new : ability to have random representative for categories. This
configuration parameter is set to false by default.
new : ability to set an element as representative of a category without
belonging to the category. Thus, administrator can choose representative
even for empty categories.
improvement : semantically superior design for category edition screen by
regrouping fields in fieldsets. The improved screen contains action
buttons as in category list screen.
new : ability to move a virtual category (ie change its parent category).
bug fixed : the sync_users function checks all user children tables
(access, cache, group association).