[QGIS-Developer] git .mailmap

[Sandro Santilli]

Hi all, I've tweaked the .mailmap file as it seemed to be failing
to do proper join of git authors. I did the tweaks by looking at
history and guessing who was who at different points in time.

Please review the output of `git shortlog -esn` to see if your
name/email is shown to your liking and if it is unique.

If you find a missing email mapping instructions can be found here:
https://git-scm.com/docs/git-shortlog#_mapping_authors


--strk;

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