Add standalone CK resolution fitter utility

Merged Christopher Rob Jones requested to merge RichRecUtils-AddCKResolutionFitter into 2017-patches

This MR makes a new standalone utility class based on the Cherenkov resolution fit used in Panoptes for the online refractive index calibration. This allows the same fit code to be reused directly in other scenarios, like DQ monitoring or the alignment.

FYI @pnaik @mmccann

Edited by Christopher Rob Jones

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