gridder.cpp update is to satisfy the future changes where we change to controlling with image plane sizes instead of aperture plane.
utils.py changes effect i/o in build gridded image to include a redundant field called 'uv_res' that only interfaces with imageIDI
imageIDI i/o is changed from using aperture plane sizes+resolutions to use image plane sizes+resolutions for a more intuitive tool. Also some QoL changes to better accommodate using LWA-SV data and correctly report information in the FITS header when images are saved on output.
Updates to three files.