Calibration and self-calibration

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Imager.setjy - Set the right amplitude, phases of point sources in MODEL_DATA column. Used prior to point source calibration.
Imager.clipimage - Zeros image pixels below a threshold. Needed for editing a model image before using it to self calibrate.
Imager.ft - Fourier Transform model images/components into the MODEL_DATA column of the MeasurementSet. This is used for self calibration.

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