[pygnulib] gnulib-python initial merge and some minor bug fixes

[Dmitry Selyutin]

Hello,

this is the very first patch after five years of silence.

It all boils down to importing gnulib-python github repository[0] as is.

I'm going to import everything except of pygnulib/testing.py.

The second patch (hotfix.patch) just includes some quick fixes.

The development is going to happen inside a standalone branch.

Once stuff becomes mature enough, it'll be pushed into the master.

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With best regards,
Dmitry Selyutin

pygnulib.patch
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hotfix.patch
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