Prestools

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* Add ``wordcount()`` function in ``prestools.misc`` and related tests.

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* Add command line interface commands and related tests for ``bioinf`` and ``misc`` modules;
* Add ``filter_type()`` function in ``prestools.misc`` and related tests;
* Clean code style.

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* Add ``hamming_distance()`` and ``mutate_sequence()`` functions in ``prestools.bioinf`` and related tests;
* Clean code style.

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* Add functions for clustering data.

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* First development release.