Changes since 0.9.1 include:
* Bugs fixed, including segfault problem with Python 1.5.2
* Take advantage of GC memory allocator in Python 2.2
* cursor.execute(query) with no arguments leaves the original
query string alone.
* Mac OS X tidy ups.
* Memory leak fixes.
* cursor.executemany() fixes.
* Other fixes (see the CHANGELOG file for details)
From PR#19056 from MLH. Note that we assume the client library is
not thread safe as per 0.9.1.
