Pierre-Yves David <pierre-yves.david@octobus.net> [Wed, 20 Dec 2017 12:36:45 +0100] rev 3320
stablesort: stop recording jump type
There are no mature user of this "jump type" data and the current implementation
is known to be buggy. So we drop the logic for now. This will make on disk
storage simpler. The data will be reintroduced later