Make the listeners for the comboboxes to check if they are the source
Make the SDFPropertiesImportWizard import properties when adding a own
name as well
Updates the navigator, when the new sdf-file has been created by the
SDFPropertiesImportWizard
Makes the open-file-dialog to start in the selected workspace root
Removes a NPE that came if pressing cancel in the open-file-dialog when
adding a properties file.
Merge pull request #25 from KlasJoenssson/Bug3504

Some fixes in the add prop. to sdf wizard