Improve call stack handling to prepare for propert tail call handling.

src/main/java/lua/value/LFunction.java

@@ -2,6 +2,8 @@ package lua.value;
 
 public class LFunction extends LValue {
 
-	
+	public String toString() {
+		return "function: "+hashCode();
+	}
 	
 }

src/main/java/lua/value/LTable.java

@@ -50,7 +50,7 @@ public class LTable extends LValue {
 		}
 
 		// perform a lua call
-		public void luaStackCall(StackState state, int base) {
+		public void luaStackCall(StackState state, int base, int top) {
 			if ( e.hasMoreElements() ) {
 				LValue key = (LValue) e.nextElement();
 				state.adjustTop(base+2);

src/main/java/lua/value/LValue.java

@@ -16,7 +16,7 @@ public class LValue {
 	}
 
 	// perform a lua call, return number of results actually produced
-	public void luaStackCall(StackState state, int base) {
+	public void luaStackCall(StackState state, int base, int top) {
 		luaUnsupportedOperation();
 	}