Changes to profiling script of ns_cpmg_2site_expanded.
The model does not have r20a and r20b, but only r2.
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
Authored by: tlinnet 2014-06-18
Parent: [r24092]
Child: [r24094]
