S = WlsToS(wls)

Converts a list of wavelengths to a [start delta num]
description. Wavelengths must be evenly spaced.

4/17/02 dhb Handle special case of one wavelength passed.
Delta argument is arbitrarily set to 0 for this case.
7/11/03 dhb Handle case the wls is passed in struct format.
1/3/12 dhb Fix check for evenly spaced wavelengths.

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