This widget provides a round analog clock display and is provided for
Forms compatibility. It installs a 1-second timeout callback using Fl::add_timeout().
The destructor also deletes all the children. This allows a
whole tree to be deleted at once, without having to keep a pointer to
all the children in the user code. A kludge has been done so the
Fl_Clock and all of it's children can be automatic (local)
variables, but you must declare the Fl_Clockfirst, so
that it is destroyed last.
