Copyright and version headers update.
Remove some outdated comments through the whole file. (vc-bzr-program-args): Remove 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. Remove 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): Remove: compatibility hacks for Emacs21, not needed in Emacs 22. (vc-bzr-dir-state): Add 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'.
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