Fixing SC in testing

[Felipe Sateler]

We currently have a broken supercollider in testing, and the freeze
means 3.5.3 will not migrate automatically.

Dan, since you are the most knowledgeable on SC matters, could you
prepare a message on why do we prefer 3.5.x instead of 3.4.x for
wheezy? I can think of:

1. Widgets (are the new qt-widgets source-compatible with the older
java-based ones?)
2. No more scons.


Any other important stuff?

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Saludos,
Felipe Sateler