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/MarkerSupportRegistry.java
* Process the extension and register the result with the tracker.
	 * 
	 * @param tracker
	 * @param extension
	 */
	private void processExtension(IExtensionTracker tracker,
			IExtension extension) {
		IConfigurationElement[] elements = extension.getConfigurationElements();
		Map groupingEntries = new HashMap();
		Collection attributeMappings = new HashSet();
		for (int j = 0; j < elements.length; j++) {
			IConfigurationElement element = elements[j];
			if (element.getName().equals(PROBLEM_FILTER)) {
				ProblemFilter filter = newFilter(element);
				registeredFilters.add(filter);
				tracker.registerObject(extension, filter,
						IExtensionTracker.REF_STRONG);
				continue;
			}
			if (element.getName().equals(MARKER_GROUPING)) {
				FieldMarkerGroup group = new FieldMarkerGroup(element
						.getAttribute(LABEL), element.getAttribute(ID));
				markerGroups.put(group.getId(), group);
				tracker.registerObject(extension, group,
						IExtensionTracker.REF_STRONG);
			}
			if (element.getName().equals(MARKER_GROUPING_ENTRY)) {
				MarkerGroupingEntry entry = new MarkerGroupingEntry(element
						.getAttribute(LABEL), element.getAttribute(ID),
						(Integer.valueOf(element.getAttribute(PRIORITY))