I've re-worked the CtxPicture module so the naming scheme is consistent, although I've had to use a rather ugly prefix for the functions (I want to import all the Basic.Kernel modules with one import so can't have name clashes).
That I've had to use ugly names makes me feel there is less value in this module now that other graphic types are more sophisticated. Maybe composing CtxPictures needs a smaller set of better combinators...
