RFC: spline / splinefun (etc) amalgamation

[Ross Ihaka]

At present R has separate functions "spline" and "splinefun".  The first
of these carries out spline interpolation of a data set and returns the
interpolated values; the second returns the interpolating function itself
(approx and approxfun are similar).

I would like to combine these into a single function "spline" with
an (optional) argument which determines which kind of value is returned.
E.g.

	spline(x,y)        # return interpolated function
	spline(x,y,fun=T)  # return the interpolating function

I would also like to propose this as a standard for smoothing and
interpolating functions.  This has a couple of advantages - fewer
names to remember and, the ability to use the function form in
model fitting code ("predict" for example).

Any objections or comments?

	Ross

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