[R] Update of addScales package with vignette on CRAN

[Bert Gunter]

I have added a couple of what I would like to think are worthwhile features
to my addScales package. More important, also a short vignette. While this
is part of the lattice graphics ecosystem, have a look at the vignette as
it may have ideas that can be adapted/improved on in other graphics
paradigms (e.g. ggplot).

Apologies for the noise -- just trying to promote better data graphics.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

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