- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
  and .keys(), .items(), .values() return dict views.

The dict views aren't fully functional yet; in particular, they can't
be compared to sets yet.  but they are useful as "iterator wells".

There are still 27 failing unit tests; I expect that many of these
have fairly trivial fixes, but there are so many, I could use help.
diff --git a/Lib/mailcap.py b/Lib/mailcap.py
index fd17f5b..086f05c 100644
--- a/Lib/mailcap.py
+++ b/Lib/mailcap.py
@@ -24,7 +24,7 @@
             continue
         morecaps = readmailcapfile(fp)
         fp.close()
-        for key, value in morecaps.iteritems():
+        for key, value in morecaps.items():
             if not key in caps:
                 caps[key] = value
             else: