Bug 115630 [Markers] New markerSupport features are not dynamic
M3 We need to add suites and test the the category support is dynamic.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
private static final String SEVERITY_HIERARCHY = "SEVERITY";
	private static final String DIRECTION = "direction";
	private static final String ASCENDING = "ASCENDING"; 
	private static MarkerSupportRegistry singleton;
	
	private static Object creationLock = new Object();
	/**
	 * Get the instance of the registry.
	 * 
	 * @return ProblemFilterRegistry
	 */
	public static MarkerSupportRegistry getInstance() {
		if (singleton == null) {
			synchronized (creationLock) {
				if (singleton == null)
					
					singleton = new MarkerSupportRegistry();
			}
		}
		return singleton;
	}
	private Collection registeredFilters = new ArrayList();
	private HashMap registeredProviders = new HashMap();
	private HashMap categories = new HashMap();
	private HashMap hierarchyOrders = new HashMap();
	private MarkerType rootType;
	/**
	 * Create a new instance of the receiver and read the registry.
	 */
	private MarkerSupportRegistry() {