Implement PEP 3115 -- new metaclass syntax and semantics.
The compiler package hasn't been updated yet; test_compiler.py fails.
Otherwise all tests seem to be passing now.  There are no occurrences
of __metaclass__ left in the standard library.
Docs have not been updated.
diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py
index fd6109c..dbca158 100644
--- a/Lib/test/test_copy.py
+++ b/Lib/test/test_copy.py
@@ -191,8 +191,8 @@
         # type.
         class Meta(type):
             pass
-        class C:
-            __metaclass__ = Meta
+        class C(metaclass=Meta):
+            pass
         self.assertEqual(copy.deepcopy(C), C)
 
     def test_deepcopy_deepcopy(self):