Add a new "outdated" field to distinguish between outdated and too new tor versions

https://atlas.torproject.org/#search/moria1 shows this text at the top: "This relay is running an outdated Tor version and should be updated to a recent release of Tor that may contain important fixes."

But the relay is running "Tor 0.3.3.0-alpha-dev". This is not an outdated Tor version -- it is newer than any of the recommended versions.

Tor has some somewhat complicated logic for deciding whether a version is obsolete -- see tor_version_is_obsolete(). Is atlas's best plan to try to reproduce Tor's logic? Should we try to specify it, e.g. in version-spec.txt, so external programs have a chance of getting it right?