Versioning

I was recently looking for a way to support building a basic Debian package for email2pdf - a fairly simple Python program I maintain. In particular, I wanted to:

• Keep the Debian build process simple - its packaging has always been a bit of a mystery to me.

• Ensure that the git revision was in some way reflected in the Debian version number in a mostly monotonic way, which solely the git revision would not, since it’s merely a SHA1 hash.

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