Added removeVars method to JDDVars.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@755 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/jdd/JDDVars.java

@@ -72,6 +72,15 @@ public class JDDVars
 		arrayBuilt = false;
 	}
 	
+	public void removeVars(JDDVars ddv)
+	{
+		int i;
+		
+		vars.removeAll(ddv.vars);
+		DDV_FreeArray(array);
+		arrayBuilt = false;
+	}
+	
 	public int getNumVars()
 	{
 		return vars.size();