Created multi dimensional error and value numpy arrays.
This is to calculate the chi2 sum much faster. Reordered the loop over missing data points, so it is only iniatiated if missing points is detected.
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
Authored by: tlinnet 2014-06-08
Parent: [r23741]
Child: [r23743]
