[lucida] Y&Y -> TUG Lucida license upgrade

[Karl Berry]

With thanks to Bigelow & Holmes, the form to allow an upgrade of the
license for the Lucida fonts for original Y&Y customers is available now:
https://www.tug.org/store/lucida/yyupgrade.html

There is no fee, but you have to be a TUG member.  (This wasn't a TUG
stipulation, by the way; B&H's lawyer was the one who felt strongly
about it.)

Hope it will be useful for some people.
karl