 * control write access (adding comments, keywords)

 * email notification of new pictures

 * list most recently created/modified rolls/topics

 * security audit

 * more docs/manuals

 * associate keywords to topics so that pictures in the topic have those
   keywords automatically.

 * add groups selection on addUser

 * automatic random passwords for new users

 * case insensitive search

 * My favorite pictures (sort on the users ratings).

 * Keep the list of selected pictures to avoid problems when rating a
   picture with "sorted by average rate"

 * List of all used keywords


BUGS:

  ' is not allowed in FrameID