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/MarkerGroupingEntry.java
id = identifer;
		sortPriority = priority;
	}
	/**
	 * Set the receiver as the default grouping entry for type markerType.
	 * @param markerType String
	 */
	public void setAsDefault(String markerType) {
		markerGroup.setAsDefault(markerType,this);
		
	}
	/**
	 * Map the attribute for the markerType to map to the receiver
	 * when it is equal to attributeValue.
	 * @param markerType
	 * @param attribute
	 * @param attributeValue
	 */
	public void mapAttribute(String markerType, String attribute, String attributeValue) {
		markerGroup.mapAttribute(markerType,attribute,attributeValue,this);
		
	}
	/**
	 * Return the id for the receiver.
	 * @return String
	 */
	public String getId() {
		return id;
	}
	/**