The data model now revolves around the three concepts of the spectrometer frequency, the dispersion
points, and the relaxation times. Peak intensity data is now handled through averaging using the
new specific_analyses.relax_disp.disp_data.average_intensity() function. R2eff/R1rho values are now
referenced by a key generated from the spectrometer frequency and nu_CPMG frequency or nu1 spin-lock
field strength. All of the specific_analyses.relax_disp package has been standardised around these
concepts. This simplifies all of the modules of the package and removes a large number of latent
bugs.