New Features:
* An extension type can inherit from another built-in or extension type.
* Extension types can have properties.
* Extension types can have C methods.
Numerous bugs have also been fixed - see the CHANGES file for details.
write code that mixes Python and C data types any way you want, and
compiles it into a C extension for Python.
Plex is now bundled with Pyrex, and the py-plex package will be obsoleted.
