tmpcommit: Finishing the splitting of SNIa param getter into params and
magnitude. Changed the magnitude getter of previous commit to only read
the SN params and continue. Somehow this is not working and is not
setting the magnitudes to any value (beside the original zero). So,
running but not giving correct results.
Checks Done:
    - Printed for a small radius 0.015 and found non-zero mags
    - Tried printing and was getting values of t0, etc.
    - Even in current run, the param values don't seem out of place, but
      magnitude values are