stablerange: directly use tuple to refer to a stable range
Now that all advance logic lives in the unified class we no longer needs the
individual class. Creating and operating on this cache introduce a significant
overhead that we can not stop having.
From now on, a range a is pair tuple '(headrev, index)'. Long live the tuple.
This software was downloaded from
http://hg.netv6.net/evolve-main/
Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
This software may be used and distributed according to the terms of the GNU
General Public License version 2 or any later version.
On Debian systems, the complete text of the GNU General Public License version
2 can be found in `/usr/share/common-licenses/GPL-2'.