Bug 129812 [Markers] Enabling problem categorization per default
Build 3.2M5 Recent progress on problem categorization should be made more proeminent by enabling categorization by default. Similar to search view doing hierarchical presentation by default nowadays.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
* Fill the context menu for the receiver.
	 * 
	 * @param manager
	 */
	abstract void fillContextMenuAdditions(IMenuManager manager);
	/**
	 * Get the filters for the receiver.
	 * 
	 * @return MarkerFilter[]
	 */
	protected final MarkerFilter[] getUserFilters() {
		return markerFilters;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.internal.tableview.TableView#handleKeyPressed(org.eclipse.swt.events.KeyEvent)
	 */
	protected void handleKeyPressed(KeyEvent event) {
		if (event.character == SWT.DEL && event.stateMask == 0
				&& deleteAction.isEnabled()) {
			deleteAction.run();
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.internal.tableview.TableView#handleOpenEvent(org.eclipse.jface.viewers.OpenEvent)
	 */
	protected void handleOpenEvent(OpenEvent event) {