Bug 214137 [Markers] Unbound system filters should be bound to problems view.
In 3.3 we supported systemFilters which are not currently picked up by the problems view. We should pick these up for compatiblity.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/CachedMarkerBuilder.java
while (filtersIterator.hasNext()) {
				MarkerFieldFilterGroup next = (MarkerFieldFilterGroup) filtersIterator
						.next();
				if (next.isEnabled())
					enabledFilters.add(next);
			}
		}
		return enabledFilters;
	}
	/**
	 * Return the generator for the receiver.
	 * 
	 * @return MarkerContentGenerator
	 */
	MarkerContentGenerator getGenerator() {
		return generator;
	}
	/**
	 * Get the raw list of marker entries.
	 * 
	 * @return list of MarkerEntry
	 */
	MarkerEntry[] getMarkerEntries() {
		if (refreshingMarkers())
			return EMPTY_ENTRY_ARRAY;
		return currentMap.toArray();
	}
	/**
	 * Get the MarkerItem that matches marker.
	 *