At Brian Wichmann's request, added words warning against
using the old Wichmann-Hill generator,  Also pointed to
a newer version of his generator, and weakened the claim
about what jumpahead() does now.

Note sure I got the LaTeX entirely correct for \seeurl.
If it's broken, please fix it ;-)

Bugfix candidate!  (These changes make just as much
sense for 2.4.)
1 file changed