(vc-rcs-workfile-is-newer): New function.
(vc-rcs-state-heuristic): Use it to guess the state of files with non-strict locking. (vc-rcs-find-most-recent-rev): Handle the case when a branch has been set with -b, but not created yet. (vc-rcs-fetch-master-state): With non-strict locking, compare file contents in order to find the state. (vc-rcs-checkin): Allow creation of branches with no changes. (vc-rcs-unregister, vc-rcs-receive-file, vc-rcs-set-non-strict-locking): New functions.
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