param.Region: Support splitting without a provided constraint

Currently, constraint is not used anyways

prism/src/param/BoxRegion.java

@@ -470,11 +470,17 @@ final class BoxRegion extends Region {
 		}
 		return result;
 	}
-	
+
 	@Override
 	ArrayList<Region> split(Function constraint)
 	{
 		// TODO could implement more clever splitting using constraints
+		return split();
+	}
+
+	@Override
+	ArrayList<Region> split()
+	{
 		if (((BoxRegionFactory) factory).getSplitMethod() == SPLIT_LONGEST) {
 			return splitLongest();
 		} else if (((BoxRegionFactory) factory).getSplitMethod() == SPLIT_ALL) {

prism/src/param/Region.java

@@ -97,13 +97,19 @@ abstract class Region {
 	/**
 	 * Splits this region into several parts.
 	 * How this is done exactly depends on the implementation in derived
-	 * classes.
+	 * classes. Can take constraint into account.
 	 * 
 	 * @param constraint
-	 * @return
 	 */
 	abstract ArrayList<Region> split(Function constraint);
-	
+
+	/**
+	 * Splits this region into several parts.
+	 * How this is done exactly depends on the implementation in derived
+	 * classes.
+	 */
+	abstract ArrayList<Region> split();
+
 	abstract ArrayList<Point> specialPoints();
 
 	abstract Point randomPoint();