Transformation of contrib/check_GNU_style.sh to a python script

[Martin Liška]

Hello.

I'm sending final (slightly updated) version of the script. I'm also adding Jakub,
because I remember he's got another regex patterns he's using for review process?
Would it be fine to just remove the old *.sh script, or is it preferred to have
them both living next to each other for some time?

Thanks,
Martin
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