zap2it site/cookie rework in cvs

I and a couple of others have reported problems using the 0.5.3 release
of tv_grab_na.

Looks as though zap2it has reworked the site a bit more than
originally suspected.

Thanks to some rather complicated investigation
by Stephen Bain, it looks like tv_grab_na has better integration
and cookie management with the new zap2it site.

New tv_grab_na/ZapListings.pm in cvs for try-out.

If testing goes well, I'd like to suggest a new release sometime
next week.

jerry

P.S. I've also added 'none' to the list of options when prompting
    for user selection of channels. That and some repackages has
    gone on in the ZapListings.pm file.