Moved the expansion of the R1 structure out of the for loops.
This is to speed-up the __init__ of the class of the target function.
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
Authored by: tlinnet 2014-06-12
Parent: [r23892]
Child: [r23894]
