Inputgen

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* Added (and documented) support for Python 2.5 to 2.6, with the install
pulling in the stand-alone ordereddict and multiprocessing libraries, if
needed.
* Added features section to readme.
* Added ``__main__`` blocks to the examples so their unittests can be run when
when running their modules directly.
* Renamed PyPI package to just "inputgen".

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* Initial release, with features including:

* Integration with Python's ``unittest`` library.
* Backtracking on accessed fields.
* Non-isomorphic generation.
* Parallel operation.