* lisp/vc/vc.el (vc-fileset-diff-incoming)
(vc-fileset-diff-outgoing): New commands.
(vc-root-diff-incoming): Refactor to call
vc-fileset-diff-incoming.
(vc-root-diff-outgoing): Refactor to call
vc-fileset-diff-outgoing.
* lisp/vc/vc-hooks.el (vc-incoming-prefix-map)
(vc-outgoing-prefix-map): Bind the new commands.
* doc/emacs/maintaining.texi (VC Change Log):
* etc/NEWS: Document the new commands.
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