Log Message:
Update devel/bzr to latest release, 2.7.0 (released 15-Feb-2016).

From the release announcement:

This <https://launchpad.net/bzr/+milestone/2.7.0> is a bugfix release
(20 bugs fixed) over the 2.6 series focusing on test issues triggered
by various python 2.7 updates.

All known fixed bugs are included here.

Users are encouraged to upgrade from the other stable series. bzr 2.7
will be the last series with active python 2.6 testing and support.
Python 2.6 hasn't received any updates since v2.6.9 of 29 Oct 2013.
Python 2.7.9 of 10 Dec 2014 was the oldest version to receive a
security fix with ssl library's match_hostname.