Speed-up of model LM63.
task #7793: (https://gna.org/task/?7793) Speed-up of dispersion models.
Change in systemtest was: test_hansen_cpmg_data_auto_analysis 13.731s -> 9.971s
test_hansen_cpmg_data_auto_analysis_r2eff 13.370s -> 9.510s
test_hansen_cpmg_data_to_lm63 3.254s -> 2.080s
Authored by: tlinnet 2014-05-19
Parent: [r23225]
Child: [r23227]
