[Elisa] [v4l2_plugin] update

[Rui Castro]

Hi,

Here's a new version of the v4l2 plugin.
The README file explains how to create a channels file.

Enhancements:
 - pipeline framerate is good, but there are still some vestige of
interlaced frames
   the pipeline is "vrl2src ! video/x-raw-yuv,framerate=24/1 ! videosink"
 - playback start and channel zapping are much more faster and smoth
 - channels file changed location. it shoud be in .elisa/video*.channels
    (one step less to create the channels file. no need to create the
directory .elisa/v4l2_channels)

Problems:
 - channel name is not changing when the channel is changed with LEFT,
RIGHT keys
   (all uris have the name of the channel in the label; don't know
what else to do)

Things missing:
 - sound (saa7134-alsa is crashing at load in the current ubuntu hardy kernel)
 - channel changing must be tested with a remote (I don't have one, yet)
 - radio is not supported yet

I'm very happy with this version. I hope someone could test it with
diferent video devices.

Rui
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