Mike, 
I was tinkering with some applications of this code.  I think that it says
that the spline will be evaluated "between control points 0 and 1".  I
think however you're also doing it between the second and (n-1)th entry in
the code-- i.e., the code forces one to do a cubic spline.   I was doing a
natural_spline and found that the last entry was always missing, and I
think this is the reason.  I'm guessing one could change just a few
keystrokes in the file and be okay, but I'm wondering if you could help me
out before my brain explodes.  

Thanks.

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