mapper work

-added support to clear existing points in item and then write new point with label
-added support to write overlay label on page load
-added support to carry overlay label through edit process
-tweaked overlay saving support to pass label not index
-added support to parse incoming overlay bounds
-added support to delete prev overlay from geo
-added support to write new overlay geo with old geo
-completed support to save overlay to temp mets
-cleaned code
-added support to save overlay if no previous geo found