Technologically speaking, this is a brilliant idea, and I am all in favor it.
However, I think we can't enable this by default. Ghostscript is licensed under AGPL, and linking it in makes LilyPond a derived work, putting it under AGPL as well. That would be effectively a license change of LilyPond, which would need consent of the current authors, and I think the Scorio folks would not be happy with. I suggest we make this an option that you have enable explicitly. If it is enabled, we'd have to change the --license output to say AGPL as well. https://codereview.appspot.com/548030043/
