Also changed the way formats are handled.  This has (and will)
reveal now hidden fmt=invalid-thing errors.

Added support for user-defined method attributes.  User-defined method
attributes can only be set or accessed for bound methods.
User-defined method attributes are stored in instances under a name
formed by concatinating the method and attribute names.  Default
values for user-defined method attributes may be set in the class
statement. For example, to define the default '__roles__' attribute of
a method, 'f'::

   class C:
      def f(self): print 'f called'
      f__roles__=('manage',)

User-defined attributes may not be set in restricted execution mode.
User-defined attribute names may only be accessed in
restricted-execution mode if their names begin with double
underscores.

Added default __cmp__ support for extension subclasses.  I only
recently noticed that extension subclasses overcome Python's
willingness to only compare objects of the same type, because they
smell to Python like numeric types.

	  strings. This is needed because cPickle (still) uses
	  a restricted eval to parse non-binary string pickles.
	  This change is needed to prevent pickles like::

	    "S'hello world'*2000000\012p0\012."

	  from hosing an application.

	- User-defined types can now support unpickling without
	  executing a constructor.

	  The second value returned from '__reduce__' can now be None,
          rather than an argument tuple.  On unpickling, if the
	  second value returned from '__reduce__' during pickling was
	  None, then rather than calling the first value returned from
          '__reduce__', directly, the '__basicnew__' method of the
          first value returned from '__reduce__' is called without
	  arguments.