vc-log-outgoing fixes for git; add binding to vc-dir
* lisp/vc/vc-dir.el (vc-dir-mode-map): Bind "O" to vc-log-outgoing. * lisp/vc/vc-git.el (vc-git-log-outgoing, vc-git-log-incoming): Use async execution. (vc-git-log-view-mode): Also truncate lines for log-outgoing and log-incoming. * lisp/vc/vc.el (vc-log-incoming, vc-log-outgoing): Don't pass nil as remote-location argument.
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