dropped print command from file menu

- it was kind of an attractive nuisance since you’ll inevitably get
better results by pulling an exported image into, say, illustrator or
preview
added CALayer to imports
shortened view classnames
now using layer-based display pipeline

- the GraphicsView now uses core animation layers to cache the script’s
output (rather than manually blitting a cached nsimage)
- disabled elastic scrolling in the graphics view
- restored support for tiff/eps pasteboards
- was able to unflip all the views (since the coord transforms are
handled by the canvas itself when it generates the bitmap)
- curious to know whether this causes a regression on retina displays…