An attempt at a recommended gitconfig

Reading How Core Git Developers Configure Git reminded me that on my first push to SWH I had to set a non-obvious pushInsteadOf. And git has many hidden good options, some of them are tied to our workflow, so why not bringing some gitconfig recommendations to this environment ?

The first proposition in this MR is a mix of the one I've been using for years with new ones I discovered in said article. Let's see if we can converge to a common denominator

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• 9ca17a06 - coherent indentation

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• 47147a56 - don't follow tags (cf.matrix#development)

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I think having some git configuration advice would be very valuable.

This file would deserve many comments, because I wouldn't trust anyone to recommend me that many settings as a single batch :-). I believe it's also okay to duplicate sections, which can help group settings in "logical" chunks

good points ! I'll add comments and split asap (not today, though)

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• d115f175 - typo spotted by @ardumont

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• cc1577b4 - git config recommandations, take2

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