[cgiapp] unescapeHTML bug fix published for CGI.pm and CGI::Simple

[Mark Stosberg]

Today I also produced some upstream patches that some others here may care
about. There was a bug in "unescapeHTML" that affected both CGI.pm and
CGI::Simple (it was the same essential code). 

 http://rt.cpan.org/Ticket/Display.html?id=41339

Scarily, I found that CGI.pm had no tests at all for the unescapeHTML()
function before today. CGI::Simple at least had a couple of pre-existing tests
for it.

    Mark