Hello,

attached is a patch against vc-bzr.el, containing some misc fixes and
improvements, most notably:

  - new customization option `vc-bzr-log-switches' (analogous to
    `vc-bzr-diff-switches'); 
  - bugfix in `vc-bzr-unregister': must not delete unregistered file; 
  - vc-bzr-command overrides only LC_MESSAGES, not the whole
    locale setting;
  - `vc-bzr-register' now works with 22.1 and CVS versions of
    `vc-find-root'.

Detailed changelog:

* Copyright and version headers update.  Remove some outdated comments
  through the whole file.
* (vc-bzr-program-args): Removed because unused.
* (vc-bzr-log-switches): New customization option.
* (vc-bzr-command): Use LC_MESSAGES=C instead of LC_ALL=C. No longer
  use `vc-bzr-program-args'.
* (vc-bzr-register): Fix for working with both 22.1 and CVS version of
  `vc-find-root' (patch by Andreas Hoenen)
* (vc-bzr-status): Update regex to match latest Bzr output. Removed
  redundant test.
* (vc-bzr-init-version): New function.
* (vc-bzr-unregister): Must not delete file.
* (vc-bzr-find-version): New function.
* (vc-bzr-checkout): Argument `rev' is explicit revision only if it's
  a non-empty string, otherwise take head revision.
* (vc-bzr-print-log): Pass `vc-bzr-log-switches' to "bzr log"
* (vc-bzr-diff): Simpler build of the revision spec string.
* (vc-annotate-convert-time, vc-bzr-annotate-difference): Removed:
  compatibility hacks for Emacs21, not needed in Emacs 22.
* (vc-bzr-dir-state): Added code comments. Removed redundant statement.
* (vc-bzr-dired-state-info): Only provide custom strings for
  overloaded VC state 'edited; otherwise fallback to
  `vc-default-dired-state-info'.

-- 
Riccardo Murri, via Galeazzo Alessi 61, 00176 Roma