Allow user to force a specific HLS bitrate to record.  Right now there is no

UI to make this easy, and I have mostly used it as a debugging tool.

To use this, the channel and iptv_channel tables need to be updated.

In the channel table, create a separate channel entry for each bitrate.  In other
words, instead of just having a SKYNEWS channel and allowing myth to auto
select the best bitrate for the available bandwidth, create three separate
SKYNEWS channels:  SKYNEWS-1, SKYNEWS-2, SKYNEWS-3.

INSERT INTO `channel` (`chanid`, `channum`, `freqid`, `sourceid`,
`callsign`, `name`, `icon`, `finetune`, `videofilters`, `xmltvid`,
`recpriority`, `contrast`, `brightness`, `colour`, `hue`, `tvformat`,
`visible`, `outputfilters`, `useonairguide`, `mplexid`, `serviceid`,
`tmoffset`, `atsc_major_chan`, `atsc_minor_chan`, `last_record`,
`default_authority`, `commmethod`, `iptvid`) VALUES
(5051,'5-1',NULL,5,'SKYNEWS-1','SKYNEWS-1','',NULL,'','19572',0,32768,32768,32768,32768,'Default',1,'',0,NULL,0,0,0,0,'2014-02-20 21:40:47','',-1,NULL),
(5052,'5-2',NULL,5,'SKYNEWS-2','SKYNEWS-2','',NULL,'','19572',0,32768,32768,32768,32768,'Default',1,'',0,NULL,0,0,0,0,'2014-02-20 21:40:47','',-1,NULL),
(5053,'5-3',NULL,5,'SKYNEWS-3','SKYNEWS-3','',NULL,'','19572',0,32768,32768,32768,32768,'Default',1,'',0,NULL,0,0,0,0,'2014-02-20
21:40:47','',-1,NULL);

In the iptv_channel table, also create a separate channel entry for each
bitrate, and set the 'bitrate' column to be the index of the desired
bitrate.

INSERT INTO `iptv_channel` (`chanid`, `url`, `type`, `bitrate`)
VALUES
(5051,'http://skynews-1.ml.llnwd.net/skynews_sd/smil:mbr_alpha.smil/playlist.m3u8','data',1),
(5052,'http://skynews-1.ml.llnwd.net/skynews_sd/smil:mbr_alpha.smil/playlist.m3u8','data',2),
(5053,'http://skynews-1.ml.llnwd.net/skynews_sd/smil:mbr_alpha.smil/playlist.m3u8','data',3);

I may change this from using an index to the actual desired bitrate.  If the
feed suddenly changes the bitrates they offer, though, that could cause it
to suddenly stop working.

If users find value in being able to select a specific bitrate, a UI will
have to be developed.
Add an "External" recorder to Myth.  This allows myth to read in a Transport Stream via a pipe from an external application.  See http://www.mythtv.org/wiki/ExternalRecorder for documentation.
Extend the time-outs in mythplayer to allow the analog side of the hvr-2250

to work.

Patch by webe3vt@aim.com

Fixes #11402