Radial power spectrum freqs

Paul Meyerrequested to merge
radial-power-spectrum-freqs into master

Three little fixes:

  • Replace legacy np.random.random call with np.random.Generator
  • Allow calling check_fresnel_number without suggesting a fresnel number (can sometimes be useful)
  • Reduce sampling of the frequency histogram for radial_power_spectrum to match the fft sampling. this prevents empty bins for asymmetric images.

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