Changes since 0.99.14:
Bugfixes, and:
src/menus.c: Scrolling implemented for popup menus that contain
more rows than the display.
src/wterm.c: included latest patches from John Skilleter
<John.Skilleter@pace.co.uk> for wheel-mouse support.
src/intrin.c: New intrinsic variable Menus_Active indicates
whether or not the menus are currently active.
src/wterm.c: fix problem with background color used when the
screen is cleared not matching the background color used in
drawing text.
