add comparision opperators, this is a major bug fix.. previously

two empty containers would compare equal causing the removal of
the first one if a later one was really removed...  The problems
of inheriting from list.. :(

It was previously masked because I would expand everything by
default and now that I don't, more items are empty exposing the
bug...

[git-p4: depot-paths = "//depot/": change = 884]

DIDLLite.py

@@ -59,6 +59,29 @@ class Object(object):
 		if kwargs.has_key('content'):
 			self._content = kwargs['content']
 
+	def __lt__(self, other):
+		return self.__cmp__(other) < 0
+
+	def __le__(self, other):
+		return self.__cmp__(other) <= 0
+
+	def __eq__(self, other):
+		return self.__cmp__(other) == 0
+
+	def __ne__(self, other):
+		return self.__cmp__(other) != 0
+
+	def __gt__(self, other):
+		return self.__cmp__(other) > 0
+
+	def __ge__(self, other):
+		return self.__cmp__(other) >= 0
+
+	def __cmp__(self, other):
+		if not isinstance(other, self.__class__):
+			return 1
+		return cmp(self.id, other.id)
+
 	def __repr__(self):
 		cls = self.__class__
 		return '<%s.%s: id: %s, parent: %s, title: %s>' % \