Some of the search utilities were still in the separate
events and superevents apps, so we moved them to the search app
and tried to clean things up a bit.  It's still kind of a mess
and probably not worth doing a full cleanup until we rework
the search.

and email notifications. This is done by parsing
the label query separately and applying the filter
in a separate step.

Fixed userprofile forms to allow blank far threshold. You have to set blank=True,null=True on the model field *and* required=False on the form field.