Added the 'TAP03' model to the dispersion auto-analysis.
This is the Trott, Abergel and Palmer 2003 R1rho analytic model for 2-site off-resonance exchange.
This follows the tutorial for adding relaxation dispersion models at:
http://wiki.nmr-relax.com/Tutorial_for_adding_relaxation_dispersion_models_to_relax#The_auto-analysis.
