* `6753235d`: Return bounded output from `rcs_diff()` when asked, as
the API states.
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* `e45175d5`: Always explicitly set CVS keyword substitution behavior.
Fixes behavior when a text file is added under a name formerly
used for a binary file.
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* `b30cacdf`: If the previous working directory no longer exists after
a CVS operation, don't try to `chdir()` back to it afterward.