Based on a patch originally written by Michael Krufky <mkrufky@linuxtv.org>
for a preliminar S2API spec.

The patch were ported to the S2API and had the ISDB-T API additions to
honor the auto mode, while keep allowing manual tuning.

Tested with both the original dvb-apps and the new dvb-apps-isdbt scan,
that uses a different channel.conf and uses S2API with ISDB-T extensions.

Thanks-to: Michael Krufky <mkrufky@linuxtv.org> for his first version
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>