Manuel

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- add a larger example of using Manuel (table-example.txt)
- make the test suite factory function try harder to find the calling
module
- fix a bug in the order regions are evaluated
- add a Manuel object that can evaluate Python code in
".. code-block:: python" regions of a reST document

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- make the global state ("globs") shared between all evaluators, not just
doctest

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- make zope.testing's testrunner recognized the enhanced, doctest-style
errors generated by Manuel
- rework the evaluaters to work region-by-region instead of on the
entire document
- switch to using regular Python classes for Manuel objects instead of
previous prototype-y style

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- first release