AJAX Updates 

This commit updates the Location Section, including the location
description, location id, country, water depth and GPS coordinates.

Modified Files:
encounter.jsp (Added the ajax functions)
EncounterSetMaximumDepth.java (removed the links from the error message)

Comments:
- The GPS coordinates can be set to any text field, meaning we may want
to add error checking.
- Eventually we'll want to remove the client side code that sets the
value on the webpage, but for now the jquery/ajax code can set some
values.

Next up -- Identity!