rearranged loads to have foreign key dependencies fulfilled
switching away from the inheritance model due to perceived threats
* also modified bbox and center so it works with my tests (bytea doesn't work)
integer id's should be INT4
Several persistance changes

* Persistance unit now parameterizable
* Remove inheritance in Java objects
* Switch to using Serialized Bbox and Center
* Added bbox and center to persistance
* Modified test to not break
Removed Item subclasses
Un-refactored DataItem change
add nbactions to ignore
Merge origin/master