Remove `diff-tree' operation, now subsumed by `diff'.
Also `revision-completion-table' now takes a list of files. (vc-deduce-fileset): Remove unused var `regexp'. Only obey allow-directory-wildcard in dired buffers. (vc-default-diff-tree): Remove. (vc-diff-added-files): New var. (vc-diff-internal): Use it. Remove arg `backend'. Update callers. (vc-version-diff): Revert from `vc-history-diff' to the original name. Remove the `backend' arg. (vc-contains-version-controlled-file): Remove. (vc-diff): Bring it closer to the version in Emacs-22. (vc-revert): Fix typo in let-binding. (vc-default-unregister): Remove. (vc-dired-buffers-for-dir): Remove N^2 behavior.
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