Using MoveHalfMaximizedWindowsBetweenScreens option user can enable
ability for moving half-maximized windows not only within current
screen/head/display, but also to other heads, if they exists. Note, that
only vertically or horizontally maximized windows can be transfered to
another display. Quarter-maximized windows are not supported, since it
is ambiguous to predict in which direction such window should be moved.
Added new option to Window Maker preferences to enable half-maximized
windows movement on all available heads. Option can be found in WPrefs
app on Expert section.