Log Message:
Update to 0.9.4. Changes:
- Fix for filtering IDMEF field using the '!=' operator, which resulted in
  filtering of events where the field did not exist (#129).
- Implement a "move" command in preludedb-admin.
- When SQL query logging is enabled, log the time taken to execute the query.
- Improve plugin API by making it opaque so that existing plugin don't break
  if we add more SQL plugin function.
- Verbose error reporting, make the plugin error API viable for more drivers.
- Fix error reporting from perl and python bindings.
- Make libpreludedb header files c++ compiler friendly.
- Enforce listed IDMEF value ordering. IDMEF value were sometime unordered
  because of an uninitialized list position problem.