16:9 Widescreen Video Support in Indytube / Flowplayer

[and]

This ticket is on the Indytube tracker here:

https://www.codecoop.org/tracker/index.php?func=detail&aid=959&group_id=90&atid=427

Currently 16:9 videos are squished to 4:3 in the transcoding process.

Extend Indytube to recognise the aspect ratio of the video and transcode it preserving original aspect ratio.

The Flowplayer must also adapt to the change in aspect ratio - either by letter-boxing (black bars above and below the widescreen video) or by changing the shape of the player itself.