ez* plotting functions

[David Bateman]

Here are all of the ez* plotting functions except ezplot itself. I'm
still not sure how to go about doing "f(x,y)=0" for ezplot in a matlab
compatible manner. However, all the other functions are pretty much
handled in the same manner and here are in fact handled by a single
function __ezplot__ that I'll probably extend to handle explot as well
when I can figure out how to do "f(x,y)=0". I believe I've handled the
treatment of singularities, that is set a point to NaN if the gradient
at the point is above some limit in the surface functions but not in
ezpolar or ezplot3. The only 2D core plotting functions missing after
this patch will be "ezplot" and "plotmatrix".

D.
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