bzr, quick pulls, and new branches

[Michael Hope]

For your records:

Loïc wrote a script that pushes the revisions from a GCC branch into
the current development focus.  This makes branching on a shared
repository much faster.  The script is here:
 http://bazaar.launchpad.net/~linaro-toolchain-dev/cbuild/tools/view/head:/enrich-gcc-linaro-repo

and it runs daily on a cronjob as the cbuild user on the 'apus' EC2
instance (phew).

We'll need to update this when 4.7 comes along.

-- Michael