Log Message:
update to 0.7.3

0.7.3 is a SECURITY FIX release of Roundup. All users are encouraged
to upgrade immediately.

2004-05-28 0.7.3
Fixed:
- add "checked" to truth values for Boolean input
- fixed import in metakit backend
- fix SearchAction use of Class.filter(), and clarify API docs for same
- ensure static files may only be served out of the tracker's "static
  files" directory