. roundup-admin create now prompts for property info if none is supplied

 . roundup-admin create now prompts for property info if none is supplied
   on the command-line.
 . hyperdb Class getprops() method may now return only the mutable
   properties.
 . Login now uses cookies, which makes it a whole lot more flexible. We can
   now support anonymous user access (read-only, unless there's an
   "anonymous" user, in which case write access is permitted). Login
   handling has been moved into cgi_client.Client.main()
 . The "extended" schema is now the default in roundup init.
 . The schemas have had their page headings modified to cope with the new
   login handling. Existing installations should copy the interfaces.py
   file from the roundup lib directory to their instance home.
 . Incorrectly had a Bizar Software copyright on the cgitb.py module from
   Ping - has been removed.
 . Fixed a whole bunch of places in the CGI interface where we should have
   been returning Not Found instead of throwing an exception.
 . Fixed a deviation from the spec: trying to modify the 'id' property of
   an item now throws an exception.

git-svn-id: http://svn.roundup-tracker.org/svnroot/roundup/trunk@272 57a73879-2fb5-44c3-a270-3262357dd7e2