Bug#548698: libtheora0: update description

[Fabio]

Package: libtheora0
Version: 1.1.0-1
Severity: minor

Libtheora description says:

"Theora is derived directly from On2's VP3 codec; currently the two are
nearly identical, varying only in framing headers, but Theora will 
diverge and improve from the main VP3 development lineage as time 
progresses."

However since theora 1.1 there have been a lot of improvements to the 
codec, which is now a lot different from VP3.