(vc-bzr-with-process-environment, vc-bzr-std-process-invocation): New macros.
(vc-bzr-command, vc-bzr-command*): Use them. (vc-bzr-with-c-locale): Remove. (vc-bzr-dir-state): Replace its use with vc-bzr-command. (vc-bzr-buffer-nonblank-p): New function. (vc-bzr-state-words): New const. (vc-bzr-state): Look for `bzr status` keywords in output. Display everything else as a warning message to the user. Fix status report with bzr >= 0.15.
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