- 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.

Lib/mhlib.py

@@ -314,7 +314,7 @@ class Folder:
         """Write the set of sequences back to the folder."""
         fullname = self.getsequencesfilename()
         f = None
-        for key, seq in sequences.iteritems():
+        for key, seq in sequences.items():
             s = IntSet('', ' ')
             s.fromlist(seq)
             if not f: f = open(fullname, 'w')