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I was thinking about removing the leading 0 from our version numbers, and realized that we can't[*] do that yet: tor_version_parse assumes that if you have a three-number version, you may not have a tag.

Let's allow two-number versions and three-number versions to have tags. And let's look into other ways to fix tor_version_parse.

[*] There are other ways to remove our leading 0. We could use four-number for alphas, and three-number versions for stable versions, as in "2.7.0.1-alpha, 2.7.0.2-alpha, 2.7.0.3-alpha, 2.7.0.4-rc, 2.7.5". Or we could have Tor report its vesion as 2.7.1-alpha to the UI, but advertise it as 0.2.7.1-alpha to other tors to work around this bug.