MyTreeRenderer: Update to use RoleData array.
MyController: Set active roles on viewing Hierarchy action.
This should be moved to a dedicated button, or automatically updated?
Images: Add folder images.
Removed old arrow-repeat image.
MyController: New method 'setActiveRoles'.
MyTreeRenderer: Update look and feel.
SQLQuery: Trimmed node description.
MyTreeRenderer: Update icons rendering.
MyController: Add setActiveRoles. 
Add this update method in a number of places to manage the changes in
teh role array.
SQLQuery: Removed testing filter on query.
MyController: Add ToolTipManager.
Register the JTree with the ToolTipManager so that it actually displays
the tool tips that have been setup in MyTreeRenderer.
SQLQuery: Trimming of Role Description.
MyTreeRenderer: Add multi-line tool tips.
Unfortunately these are quite slow to appear, and as such I have
disabled them until I can find a better solution.
MyController: Add comments.
MyView: Add Row Sorter to the tables.