changes by EAM:
* added lensing terms to ForcedWarpMeasurement & ForcedMeanObject
* removed fluxPeak and momentRH generally
* changed psfWidMajor,Minor to psfMajorFWHM,psfMinorFWHM
* added psfCore (k term in psf model : 1 / (1 + kz + k^1.667)
* fixed stack flux & mag names
* set units for moments to be in arcsec everywhere.

