(vc-status-prepare-status-buffer): Fix thinko.

(vc-status-prepare-status-buffer): Fix thinko.
(vc-status-menu-map): Add binding for
vc-status-kill-dir-status-process.  Add :enable for vc-status-refresh.
(vc-status-menu-map-filter): Remove vc-ignore-menu-filter test.
(vc-status-tool-bar-map): Add binding for vc-status-kill-dir-status-process.
Don't test display-graphic-p and don't bind vc-ignore-menu-filter.
(vc-update-vc-status-buffer, vc-status-kill-dir-status-process):
Reset vc-status-process-buffer.
(vc-status-refresh): Don't run two refreshes at a time.
(vc-status): If the buffer is already in vc-status-mode only refresh.