Remove unnecessary leading * in docstrings.

Remove unnecessary leading * in docstrings.
(vc-annotate-mode-map): Move initialization into declaration.
(vc-static-header-alist): Nitpick on the regexp.
(vc-default-init-version): New fun.
(vc-register): Use it.
(vc-insert-headers): Use dolist.
(vc-annotate-get-backend): Remove unused function.
(vc-annotate-add-menu): Remove.  Build the menu directly at toplevel.
(vc-annotate-mode): Remove corresponding call.
(vc-annotate-car-last-cons): Simplify.
(vc-annotate-buffers): Remove var.
(vc-annotate-backend): Make it buffer-local.
(vc-annotate): Move the interaction to the interactive spec.
Add a `buf' argument.
(vc-annotate-warp-version): Use this new `buf' argument to avoid
killing&creating a vc-annotate buffer, which is very disruptive when
the buffers are shown in dedicated frames.