`flamenco-worker -version` now shows the 'extended' version. This is just
the application version when running a release build. Otherwise it will
be like `3.3-alpha0 (v3.2-nn-ghhhhhh)`, where `nn` is the number of commits
since the last-tagged version (`v3.2` in this example), and `ghhhhhh` is
the Git hash. This can optionally be suffixed by `-dirty` if there were
any uncommitted changes when Flamenco was built.
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