[geos-devel] git .mailmap

[Sandro Santilli]

I've added a .mailmap file to the repository so that `git shortlog`
correctly groups commits by people who for any reason changed their
git attribution (name,email) over time.

Committers please review .mailmap file in the root of the repository
if you want to be recognized in some other way from what I've guessed.

HINT: use `git shortlog -ens` for a quick view of what we have so far

--strk; 

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