Deprecate Data.Version.versionTags (#2496)

The library submission was accepted:

  http://www.haskell.org/pipermail/libraries/2014-September/023777.html

The T5892ab testcases were changed to use `Data.Tree` instead of `Data.Version`

Reviewed By: ekmett

Differential Revision: https://phabricator.haskell.org/D395