Bug 221337 [Markers] MarkerItem has too much API
We are exposing too much as API in MarkerItem. We should only provide getAtttributeValue and the methods that support PATH_ATTRIBUTE and NAME_ATTRIBUTE as they are tricky. Everything else needs to be pushed down to an internal class. We should mention the relevant IMarker constants for those removed.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
* (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getColumnHeaderText()
		 */
		public String getColumnHeaderText() {
			return markerGroup.getTitle();
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getDefaultDirection()
		 */
		public int getDefaultDirection() {
			return TableComparator.ASCENDING;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getDescription()
		 */
		public String getDescription() {
			return markerGroup.getTitle();
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getDescriptionImage()
		 */
		public Image getDescriptionImage() {
			return null;