instead of a boolean flag on SvgCompositor, added PrintMorph and a method on Compositor for providing one
made 'rotate' the third property, instead of the first, on PrintMorph and defaulting to zero
changed the tests to use the 'print' renderset (not 'screen')
put in conditionals to eventually gracefully handle SVG frames, though for the moment it just raises UnsupportedOperationException
removed the 'compositor' key in the render set descriptor
deleted the AwtCompositor and screen renderset, as neither is needed now that the SVG stuff is fully functional
removed a couple remaining dregs of the JAXB stuff I'd originally set up for the SVG stuff, but didn't end up using