Add method to retrieve given annotation linked to object.

Method useful to retrieve annotation like modulo annotation
added at import time.
Fix class cast exception.
Fix query to load annotations.
Add tests for modulo retrieval.
Add modulo namespace to constant.
Add test to create XML annotation.
Review existing tests.
Add modulo ns to pojos and add test using modulo ns.
Fix documentation.
Add pixels to the list of supported type. Test added too
Improve Java doc.
scons: Update to version 2.2.0
Remove Import Location from Import Window and always show the Import Location PopUp on image selection
Remove logic around showing location as popup as we always show it as a popup window now
Refactor import location pane to be tab based
Squash some refactor bugs
Refactor UI related code for import location dialogue
Location Dialog layout compiling
More changes to the UI code
Refactor in progress, NPEs at the moment, may need to revert and try again