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Implemented the 'MMQ 2-site' CPMG model equations from the Korzhnev et al., 2005 reference.

The paper reference is:
- Dmitry M. Korzhnev, Philipp Neudecker, Anthony Mittermaier, Vladislav Yu. Orekhov, and Lewis
E. Kay (2005). Multiple-site exchange in proteins studied with a suite of six NMR relaxation
dispersion experiments: An application to the folding of a Fyn SH3 domain mutant. J. Am. Chem.
Soc., 127, 15602-15611. (doi: http://dx.doi.org/10.1021/ja054550e).

The original code from Mathilde Lescanne and Dominique Marion has only slightly been modified for
this change as the MQ data treatment in the Korzhnev et al., 2004 reference is the same as in the
2005 reference, but using a different notation. This has been renamed to r2eff_mmq_2site_mq().

The new r2eff_mmq_2site_sq_dq_zq() function has been added to the lib.dispersion.mmq_2site module to
allows the SQ, DQ, and ZQ R2eff data to be calculated. This function follows the notation of the
2005 paper.

The populate_matrix() function has been modified to only accept one combined chemical shift
difference value. It can now also accept different values for R20A and R20B, though the mmq_2site
module defaults to R20A=R20B.

bugman 2013-11-18

changed /branches/relax_disp/lib/dispersion/mmq_2site.py
changed /branches/relax_disp/target_functions/relax_disp.py
/branches/relax_disp/lib/dispersion/mmq_2site.py Diff Switch to side-by-side view
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