8.5.12 initPhases(self):

initPhases $<$ DataEntity: $<$ BoaDataEntity.py

        NAM: initPhases (method)
        DES: Compute the phase differences from the raw data.
             New attributes are defined here, with names similar to
             the initial ones, with _p appended. They are 2D or 3D
             arrays, where the 1st dim. corresponds to integrations,
             the 2nd dim. means:

             0 = phase diff,
             1 = phase1,
             2 = phase2
             
             and the 3rd dim. corresponds to pixels, when relevant.
        INP: self = DataEntity object