Fix a bug in how comparison instructions are handled: the 'a' intruction field

was ignored.  Includes new test case.

src/main/java/lua/CallFrame.java

@@ -223,7 +223,7 @@ public class CallFrame {
 				rkb = GETARG_RKB(i);
 				rkc = GETARG_RKC(i);
 				boolean test = rkc.luaBinCmpUnknown(o, rkb);
-				if (test)
+				if (test == (a == 0))
 					pc++;
 				continue;
 			}

src/test/java/lua/LuaJTest.java

@@ -43,6 +43,10 @@ public class LuaJTest extends TestCase {
 		runTest( "test7" );
 	}
 	
+	public void testCompare() throws IOException, InterruptedException {
+		runTest( "compare" );
+	}
+	
 	public void testUpvalues() throws IOException, InterruptedException {
 		runTest( "upvalues" );
 	}

src/test/res/compare.lua

@@ -0,0 +1,12 @@
+if 2 < 5 then
+	print("OK!")
+else
+	print("Something is not right")
+end
+
+print(2 < 5)
+print(2 <= 5)
+print(2 == 5)
+print(2 ~= 5)
+print(2 > 5)
+print(2 >= 5)