Comparison of TreeKeys can lead to false positives

It could be that TreeKey comparison should also compare parents because some books like Pilgrim's Progress can have keys with identical names but different parents.

Here is a junit
Book book = getBook("Pilgrim");

// flatten and cache all the keys
List<Key> cachedKeyList = new ArrayList<Key>();
for (Key key : book.getGlobalKeyList()) { cachedKeyList.add(key); }

// get Part II/First Stage key
Key partIIFirstStage = cachedKeyList.get(20);
assertEquals("wrong key", "THE FIRST STAGE", partIIFirstStage.getName()); // these 2 tests pass fine
assertEquals("wrong key", "PART II", partIIFirstStage.getParent().getName()); // they just clarify which key we have

// now try to find the above key in our cached list of keys but the wrong key is returned
int indexOfKey = cachedKeyList.indexOf(partIIFirstStage);
// this test fails because Part I/First Stage is returned instead of Part II/First Stage
assertEquals("Wrong index", 20, indexOfKey);