* Switch from VOEventLib to voevent-parse due to significant
  string-bytes issues in VOEventLib
* Remove bad exception handling in events API for creating a
  VOEvent
* Add parameter checking to events API for creating a VOEvent
* Combine VOEvent building code for events and superevents into
  a single instance which handles both cases

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.

All calls to event.graceid() -> event.graceid.

* Consolidated *all* of the search stuff into the search app
  (previously the flexigrid stuff was in events/superevents)
* Completely removed the old events-only search and latest views,
  templates, etc.
* Removed some old unit tests which tested the events-only search