Make use of tmux instead of screen.

Includes splitscreen for SuperCollider output on the right side. Could easily be modified to make it show on the left side, too ;)
Makes it much more convenient to work with vim in split mode, because you can tile it all in one screen (including the SuperCollider output).
tmux on top is generally more and easier configurable than screen and should be preferred.

It will automatically be used if you start scvim in tmux. $TERM=screen-256color should be set!

![tmux-ide](https://f.cloud.github.com/assets/432519/1478079/a24598a2-4666-11e3-87da-9e49c153f19f.png)