Bug 110998 [Problems] Remove the working set selection and switch to using global working sets
M2 We need to remove the working sets option in the filter and switch to using the current list of working sets. We should move this to a preference that says only "Use Working Sets"
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
*      org.eclipse.core.runtime.IExtension)
	 */
	public void addExtension(IExtensionTracker tracker, IExtension extension) {
		processExtension(tracker, extension);
	}
	/**
	 * Get the collection of currently registered filters.
	 * 
	 * @return Collection of ProblemFilter
	 */
	public Collection getRegisteredFilters() {
		return registeredFilters;
	}
	/**
	 * Get the constant for scope from element. Return -1 if there is no value.
	 * 
	 * @param element
	 * @return int one of MarkerView#ON_ANY MarkerView#ON_SELECTED_ONLY
	 *         MarkerView#ON_SELECTED_AND_CHILDREN
	 *         MarkerView#ON_ANY_IN_SAME_CONTAINER
	 */
	private int getScopeValue(IConfigurationElement element) {
		String scope = element.getAttribute(SCOPE);
		if (scope == null)
			return -1;
		if (scope.equals(ON_ANY))
			return MarkerFilter.ON_ANY;
		if (scope.equals(ON_SELECTED_ONLY))
			return MarkerFilter.ON_SELECTED_ONLY;
		if (scope.equals(ON_SELECTED_AND_CHILDREN))