Non-linear coefficients V1

First version of the non-linear coefficients for non-linearity correction on PACS's signal.

This non-linear coefficients calibration product is used to correct the PACS Photometer signal
for non-linearity. It is derived by fitting the bolometers middle points measured in 2006-2007
during the ground-segment calibration campaign at the PACS P.I. institute, MPE. Please see the
associated report PICC-NHSC-TR-031 for a detailed description of the non-linearity correction
and the generation of the calFiles.

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