Marker for editor

Yesterday I finished the test refactorings. So today I started to do some maintenance. At the moment users have to scan for marker to see them in the editor. The markers are persistent and saved when quitting the workspace.
An enhancement would be to update the marker for the open editor (and no scan for all projects in the workspace will be neccessary anymore).
To implement this I created MarkerUpdater which handles the creation of the markers of an IType. To eat my own food, I used MoreUnit to create plugin tests for MarkerUpdater :-)