Fix a few VM issues which were causing subtle failures in the test cases.

Includes a new VM method, newCall, which must be called before pushing
a call onto the stack to make sure that base is set correctly.
A couple of weird issues remain with autoload.lua.

src/test/java/lua/LuaJTest.java

@@ -51,7 +51,11 @@ public class LuaJTest extends TestCase {
 	public void testBoolean() throws IOException, InterruptedException {
 		runTest( "boolean" );
 	}
-	
+
+	public void testCalls() throws IOException, InterruptedException {
+		runTest( "calls" );
+	}
+
 	public void testCoercions() throws IOException, InterruptedException {
 		runTest( "coercions" );
 	}