* lisp/vc/vc-git.el (vc-git-root-log-format): New option for
customizing log format.
(vc-git-print-log, vc-git-log-outgoing, vc-git-log-incoming)
(vc-git-log-view-mode): Use it.
(vc-git-expanded-log-entry): New function.
(vc-git-log-view-mode): Use it. Truncate lines in root log.
* lisp/vc/vc-hg.el (vc-hg-root-log-template): New option for
customizing log format.
(vc-hg-print-log): Use it.
(vc-hg-expanded-log-entry): New function.
(vc-hg-log-view-mode): Use vc-hg-root-log-template and
vc-hg-expanded-log-entry. Truncate lines in root log.
* lisp/vc/vc-bzr.el (vc-bzr-log-view-mode): Truncate lines in root log.
* lisp/vc/log-view.el (log-view-mode-menu): Add
log-view-toggle-entry-display.
* vc/vc-dispatcher.el (vc-set-async-update): New function for
updating Dired or VC-dir buffers after async command completes.
* vc/vc-bzr.el (vc-bzr-async-command): Return the process buffer.
(vc-bzr-pull, vc-bzr-merge-branch): Use vc-set-async-update.
* vc/vc-git.el (vc-git-merge-branch): Add FETCH_HEAD to branch
completions if it exists. Use vc-set-async-update.
(vc-git-pull): Use vc-set-async-update.
* vc/vc-hg.el (vc-hg-pull): Fix default-contents arg to
read-shell-command. Use vc-set-async-update.
(vc-hg-merge-branch): Use vc-set-async-update.
* lisp/vc/vc.el (vc-pull): Make vc-update an alias for this, instead of
the other way around.
* lisp/vc/vc-git.el (vc-git-branches, vc-git-pull)
(vc-git-merge-branch): New functions.
(vc-git-history): New var.
* lisp/vc/vc-hg.el (vc-hg-history): New var.
(vc-hg-pull): Perform default pull if called via Lisp by vc-pull.
(vc-hg-merge-branch): New function.