Rework the main API"s that implement the calling convention. Provide utility methods to get arguments that were supplied, and provide return values. Add a VM interface to clarify the relationship between the VM, things that call the VM, and things that are called by the VM. Make the code more closely aligned with the C++ version.

src/test/java/lua/LuaJTest.java

@@ -95,7 +95,7 @@ public class LuaJTest extends TestCase {
 		try {
 			// create closure and execute
 			Closure c = new Closure( state, p );
-			state.doCall(c, new LValue[0], 0);
+			state.doCall(c, new LValue[0]);
 			
 			final String actualOutput = new String( outputStream.toByteArray() );
 			final String expectedOutput = getExpectedOutput( testName );