Important fix for extracting the correct shape to create new arrays.
If using just one field, or having the same number of dispersion points, the shape would extend to the dispersion number.
It would report [ei][si][mi][oi][di] when calling ndarray.shape.
Shape always has to be reported as: [ei][si][mi][oi].
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
