Reimplemented anti-csrf measures by raising exceptions rather than returning booleans. Redoing it using exceptions was the easiest way to return proper xmlrpc fault messages to the clients. Also this code should now properly make values set in the form override values from the database. So no lost work under some circumstances if the csrf requirements are not met. Also this code does a better job of cleaning up old csrf tokens.

License
=======

Roundup is Free Software under the following license (from the file
COPYING.txt in the software distribution):

  .. include:: ../COPYING.txt
    :literal: