- 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.

sysconfig.py

@@ -271,7 +271,7 @@ def parse_makefile(fn, g=None):
 
     # do variable interpolation here
     while notdone:
-        for name in notdone.keys():
+        for name in list(notdone):
             value = notdone[name]
             m = _findvar1_rx.search(value) or _findvar2_rx.search(value)
             if m: