Log Message:
wm/ctwm: update to version 4.1.0.

The major new feature of this release is multi-monitor support via
XRANDR.  It also includes some EWMH improvements and various minor
bugfixes.

It also removes several obsolescent features, major among them being
VirtualScreens.  The multi-monitor support added is far more capable and
less weirdly buggy.  If you're currently using VirtualScreens, however,
be prepared for things to work out rather differently on upgrade.

Further details are available in the CHANGES.md in the tar or on the
website http://www.ctwm.org/CHANGES.html .