Add a time command to data

* Since we're logging in zulu time, add a convenient tool to the `data` command to output the date in that format.
* Remove triple level verbosity from this command line tool. Run quiet or debug.

AfC
Ah. Yes, we should probably decide what variant of semantic versioning we're following around here. I was doing the Haskell "package versioning policy" which has in A.B.C.D that A.B are major, C is minor, and D is patchlevel. I tend to find that overkill to be honest; I'm happy with X.Y.Z being major, minor, patch. @christian-marie @thsutton ?