Updates based on feedback from porcelli's Drools upgrade
Working around an issue where SimpleWorkbenchPanelPresenter was not being registered as a bean type

The workaround was to change SimpleDndWorkbenchPanelPresenter to extend AbstractWorkbenchPanelPresenter directly.
UF-139: fixed filename mismatch when saving and loading perspective defs

this just one part of the complete fix
UF-139: fixed save of perspectives so they are not cleared before saving :)

this is the second and final part of the fix.