Bug 214648 [Markers] AttributeMarkerGroupings and GroupingEntries not being cleaned up on removal
We are still leaving the references to AttributeMarkerGroupings and GroupingEntries when we unload
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/AttributeMarkerGrouping.java
private String attribute;
	private String markerType;
	private String defaultGroupingEntry;
	private IConfigurationElement element;
	/**
	 * Create a new instance of the receiver for the given attribute on the
	 * markerType with an optional default grouping.
	 * 
	 * @param attributeId
	 * @param markerId
	 * @param defaultEntry
	 * @param configElement
	 */
	public AttributeMarkerGrouping(String attributeId, String markerId,
			String defaultEntry, IConfigurationElement configElement) {
		attribute = attributeId;
		markerType = markerId;
		defaultGroupingEntry = defaultEntry;
		element = configElement;
	}