shuttle v0.1.15

• gui_plan with no window in front. When no window is in front, as on GNOME while _NET_ACTIVE_WINDOW names none and no listed window is active, a wait step takes the one listed window that carries its title and brings it to the front, and a step that names no window acts in the plan's last window when one listed window has its title, bringing it to the front first. Before, wait failed with expected window "…" did not appear while its own window list held that title, and the next step failed with no focused window. Two listed windows with the awaited title still fail the step, with no window in front, an AT-SPI alert is not taken for the awaited window, and a plan with no window of its own yet still stops at no focused window. Background plans are unchanged.