List the change log of the current fileset in a window.
If WORKING-REVISION is non-nil, leave point at that revision.
If LIMIT is non-nil, it should be a number specifying the maximum
number of revisions to show; the default is `vc-log-show-limit'.
When called interactively with a prefix argument, prompt for
WORKING-REVISION and LIMIT.
(fn &optional WORKING-REVISION LIMIT)