All tests now succeed on all platforms again;

'optional' expected messages added.
expanded some tests.
Added a check if the bootclasspath supports a certain version, i.e. don't try to run a JDK7-only test if AutoClosable isn't available.

test/transform/resource/before/MixGetterVal.java

@@ -8,5 +8,7 @@ class MixGetterVal {
 	public void test() {
 		val y = x;
 		m(y);
+		val a = getX();
+		m(a);
 	}
 }