Corrected attenuator table for VSANS to include the range 4.52->19. Patching of the attenuation factor is disabled since the factor is always calculated rather than read from the file.
Added a few help links in preparation for the full help file integration
Added a "super" white beam distribution definition and a single model function for testing of this new mode. Still need the normalization and mean wavelength for the distribution + a way to identify it in the file metadata.