bob.db.maskattack release

Dear Bob Masters,

I revived the old xbob.db.maskattack project (https://gitlab.idiap.ch/bob/xbob.db.maskattack), and it looks like the new version is fine (according to the CI at least). So, I would like to release it - I'll need that for the package of my chapter in hobpad2.

However, and due to my lack of confidence with these matters, it would be nice if one of you could take a little time to review what I did, point me to potential issues and stuff to correct - and eventually give me a green light to proceed with the release.

Thanks

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