Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Thu, 16 Jun 2011 01:57:53 +0200] rev 14643
hidden: Add a hiddenrevs attributes to changelog.
This attributes hold the set of all revisions that should be ommited by command
and tools displaying changesets.
This set is given as a hit. Command and tools are responsible to check it in
order to filter they outpur.
Code adding revisions to the set are responsible to the consistency of it's
data.