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argument.  Add a new method: root.

* vc-hooks.el (vc-prefix-map, vc-menu-map): Add bindings for
vc-print-root-log and vc-print-root-diff.

* vc-bzr.el (vc-bzr-log-view-mode, vc-bzr-print-log):
* vc-git.el (vc-git-print-log, vc-git-log-view-mode):
* vc-hg.el (vc-hg-print-log, vc-hg-log-view-mode): Add support for
short logs.

* vc-cvs.el (vc-cvs-print-log):
* vc-mtn.el (vc-mtn-print-log):
* vc-rcs.el (vc-rcs-print-log):
* vc-sccs.el (vc-sccs-print-log):
* vc-svn.el (vc-svn-print-log): Add an optional argument shortlog
that is ignored for now.