Spline improvments

[Marco Caliari]

Dear maintainers,

I would like to submit the enclosed patch over the development version of 
spline.m, doing the following:

*) if length (x) == 3, the result is the unique polynomial of degree 2 
instead of a polynomial of degree 3 with the first coefficient set to 
zero.

*) if length (x) == 2, the result is the unique polynomial of degree 1, or 
the unique polynomial of degree 3 if a complete spline is required.

*) it manages the case x not sorted (by sorting it).

The Changelog could be

2010-11-15  Marco Caliari  <address@hidden>

        * spline.m:  Allow length (x) == 2 and x not sorted.

Best regards,

Marco

spline.m.diff
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