please randomize automated tv_grab_na_dd runs

In case you don't follow the Data Direct forums, the Data Direct
servers are getting hit very hard during the overnight hours and they
would like the load randomized through the day.

Of course, most of us (myself included) are grabbing at night to make
things easier for them!  Guess that only works for scrapers where the
interactive users are the primary clientele.

Here's a suggestion on how to pick a random poll time.

Hour: Day of Birth within month (subtract 24 if over 24)
Min:  Minute right now!

Balancing the load on their servers not only helps Zap2it provide the
service, it can provide faster throughput for us too.

Robert
tv_grab_na_dd author/maintainer.


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