Log transcoding filespace savings

[Robert Tsai <rtsai1111>]

This patch adds some logging to record mythtranscode filespace savings. In the database, it adds (pasted from mythweb):

4622  	transcode  	2005-09-11 18:41:22  	myth  	Transcode Finished  	Secrets of the Dead "Mystery of the Black Death": 1.9 GB (Medium Quality)
4621 	transcode 	2005-09-11 17:00:15 	myth 	Transcode Starting 	Secrets of the Dead "Mystery of the Black Death": 6.0 GB (Medium Quality)

In the jobqueue table, it adds the following text, which will appear on the mythweb backend status page (pasted from mysql):

| 963 |    1 |    0 |    272 | Low Quality: 7.8 GB => 1.6 GB      |
| 964 |    2 |    0 |    272 | Finished, 1 break(s) found.        |
| 965 |    1 |    0 |    272 | Medium Quality: 6.0 GB => 1.9 GB   |
+-----+------+------+--------+------------------------------------+

It also does a little bit of logging cleanup (removing redundantly-logged information).

[Robert Tsai <rtsai1111>]

updated diff against r7255

[cpinkham]

(In [7263]) JobQueue, mythtranscode, and logging related modifications.

Main patches by Robert Tsai & Aaron McCarthy with a little merging by me.

• Add logging to display mythtranscode's filespace savings.

• Logging cleanup and addition of subtitle (if present) in some places.

• Regenerate MARK_GOP_BYFRAME index on recordings that only have MARK_GOP_START since the transcoder needs MARK_GOP_BYFRAME.

• Cleanup old keyframe/gop index in mythtranscode rather than having the JobQueue do it. The JobQueue has no way of knowing whether mythtranscode generated a MPEG2 file and corresponding MARK_GOP_BYFRAME entries or if it generated a MPEG4/RTJPEG file with the seektable in the nuppel file, so it only makes sense to move this logic into mythtranscode.

Closes #325 and closes #237.

[Robert Tsai <rtsai1111>]

There is a small typo in r7263. Patch attached.

[Robert Tsai <rtsai1111>]

fix typo in r7263

[cpinkham]

(In [7265]) Patch by Robert Tsai to fix a typo in my previous merge. (Re) closes #325.