bzr and bzrtools packages

[Tom Metro <tmetro@gmail.com>]

I have:
deb     http://www.backports.org/debian   lenny-backports main contrib 
non-free

in my sources.list, and recently installed the bzr package, but noticed 
I received version 1.5, instead of 1.13, which appears to be the latest 
in the backports.org repository:
http://backports.org/debian/pool/main/b/bzr/

I see in apt.conf, I had added:
APT::Default-Release "stable";

which probably explains why I didn't get the latest version. (I guess I 
should remove that if I want to pull in the latest versions from 
backports automatically. I think I added that a long time ago when I was 
using a few packages from testing.)

But when I tried:

# aptitude install bzr=1.13.1-1~bpo50+1
[...]
The following packages are BROKEN:
  bzrtools
The following packages will be upgraded:
  bzr
The following packages have unmet dependencies:
  bzrtools: Depends: bzr (< 1.6~) but 1.13.1-1~bpo50+1 is to be installed.

And:
# aptitude install bzr=1.13.1-1~bpo50+1 bzrtools=1.13.1-1~bpo50+1
[...]
Unable to find a version "1.13.1-1~bpo50+1" for the package "bzrtools"


It appears that version 1.13 of bzrtools is absent from the repository:
http://backports.org/debian/pool/main/b/bzrtools/

 -Tom