[mythtv] [experimental patch] setup pcHDTV & PVR-x50

[Daniel Thor Kristjansson]

This changes the setup for the pcHDTV card and the PVR-x50.

For the pchdtv I'm creating two device entries, one for the ATSC 
hardware and one for the bttv hardware. I've added a column to 
capturecard called "parentid" which contains the parent card's cardid. 
This is prevents the 'daughter' bttv card from being listed as seperate 
hardware, and also lets us find it when we are editing the pcHDTV card 
entry in the Capture Card setup. This should also let us treat the 
bttv inputs as extra inputs on the pcHDTV when scheduling recordings, so 
we don't try to record from both at the same time (they share a tuner).

For both the pcHDTV and PVR-x50, I've eliminated inputs that don't make 
sense for MPEG streaming cards, such as the audio and vbi device 
entries. There are vbi and audio entries in the pcHDTV configure dialog, 
but these are for the bttv 'daughter' card. I've also made the device 
selection smarter. For the pcHDTV digital input I've restriced the valid 
device entries to those with device minors greater than or equal to 32, 
and for the PVR-x50 and the pcHDTV analog input I've restricted valid 
device entries to those with minor numbers less than 16. I also check 
the device entries so that there are no duplicate entries. For example, 
if there is a /dev/v4l/video32 entry, a /dev/dtv and /dev/dtv0 entry all 
referring to the same device, I only list the /dev/v4l/video32 entry.
I used the major() and minor() macro's so this should work with POSIX 
systems other than Linux.

This shouldn't be applied right now, because it will mess up the 
recorder logic if you connect any of the analog inputs of the pcHDTV
to a 'Video Source'. But I welcome comments. This is my first attempt at 
really doing anything with the MythTV user interface classes, so I may 
have handled the loading the bttv card incorrectly. Also, as far as I 
know the vbi and audio device inputs of the PVR-x50 aren't used, but 
I've never actually worked with that code....

This also breaks the dbcheck exit cleanup patch, and upgrades the db 
version. So either backup and restore the db, or reset the db version 
and drop the new capturecard column when done trying this patch.

-- Daniel
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