Pyoai

- OAI_DC and DC namespace declarations should not be declared on the
document root, but on the child of the metadata element. According to
the OAI spec

- When specifying a date (not a datetime) for the until parameter,
default to 23:59:59 instead of 00:00:00

- Included support for description elements in OAI Identify headers,
added ‘toolkit’ description by default.

- Raise correct error when from and until parameters have different
granularities

- Fixed bug and added tests for handling invalid dateTime formats, the
server will now respond with a BadArgument (XML) error instead of a
python traceback.

- Use buildout to create testrunner and environment as opposed to
``test.py`` script.

Install buildout by:

$ python bootstrap.py $ bin/buildout

Run the tests by doing:

$ bin/test

To get a python interpreter with the ``oaipmh`` library importable::

$ bin/devpython

- Added xml declaration to server output
- Prettyprint xml output
- compatibility fix: should be compatible with lxml 2.0 now
- server resumption tokens now work with POST requests.
- Fix for client code that handles 503 response from server.