Bug 129812 [Markers] Enabling problem categorization per default
Build 3.2M5 Recent progress on problem categorization should be made more proeminent by enabling categorization by default. Similar to search view doing hierarchical presentation by default nowadays.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
* Get the category associated with marker. Return <code>null</code> if
	 * there are none.
	 * 
	 * @param marker
	 * @return String or <code>null</code>
	 */
	public String getCategory(IMarker marker) {
		try {
			return getCategory(marker.getType());
		} catch (CoreException e) {
			Util.log(e);
		}
		return null;
	}
	/**
	 * Get the category associated with markerType. Return <code>null</code>
	 * if there are none.
	 * 
	 * @param markerType
	 * @return String or <code>null</code>
	 */
	public String getCategory(String markerType) {
		if (categories.containsKey(markerType)) {
			return (String) categories.get(markerType);
		}
		return null;
	}
	/**
	 * Return the TableSorter that corresponds to type.
	 *