Important fix for replacing values if eta_pos > 700 is violated.
This fixes systemtest: Relax_disp.test_sod1wt_t25_to_cr72, which failed after making kex to a numpy float.
The trick is to make a numpy mask which stores the position where to replace the values. Then replace the values just before last return.
This makes sure, that not all values are changed.
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
Authored by: tlinnet 2014-06-10
Parent: [r23796]
Child: [r23798]
