(vc-simple-command): New function.
(vc-fetch-master-properties): CVS case: Use it. (vc-lock-from-permissions, vc-file-owner, vc-rcs-lock-from-diff): New functions. (vc-locking-user): Largely rewritten. Uses the above, handles RCS non-strict locking. Under CVS in CVSREAD-mode, learn the locking state from the permissions. (vc-find-cvs-master): Use vc-insert-file, rather than find-file-noselect. Greatly speeds up things. (vc-consult-rcs-headers): Bug fix, return status in all cases.
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