perlunicook

Quite a while ago, Tom Christiansen provided a "perlunicook" document for "how
to do stuff with Unicode text in perl5 without shooting yourself in the foot."

It's now rebased on blead and you can see it here:

  https://github.com/Perl/perl5/compare/blead...rjbs/unicook

What do we think about including it with 5.22?

-- 
rjbs