Refactor codegen tests

- initialize environment only once in setUp()
- add comments on why some tests are disabled
- modify and rename some tests
- re-enable now working tests
- extract some tests into files with box()
- remove useless 'throws' declarations and commented code

compiler/tests/org/jetbrains/jet/codegen/AnnotationGenTest.java

@@ -53,7 +53,6 @@ public class AnnotationGenTest extends CodegenTestCase {
     public void testPropSetter() throws NoSuchFieldException, NoSuchMethodException {
         loadText("var x = 0\n" +
                  "[Deprecated] set");
-//        System.out.println(generateToText());
         Class aClass = generateNamespaceClass();
         assertNull(aClass.getDeclaredMethod("getX").getAnnotation(Deprecated.class));
         assertNotNull(aClass.getDeclaredMethod("setX", int.class).getAnnotation(Deprecated.class));