[mythtv] [PATCH] use presets instead of channums

[Ben Bucksch]

Thanks, Bjorn.

Just so you know, the DVB patch I was working on (see previous posts, 
including preliminary patches) places tuning parameters (channum, 
finetuning, other parameters for DVB) in a new column and the actual 
tune function uses those new values, so you can factually use the 
channum column as preset, without needing to change all the code that 
references channum. It's then basically only a name change to change 
"channum" to "preset".

Ben