add options to nus filter

Currently, the NUS reconstruction has options to control the behavior of the Iterative thresholding process. it possible to expose the options to the user,

{
    maxThreshold = 0.9,
    increaseFactor = 1.5,
    percentToReachMax = 0.5,
    threshold = 0.5,
    iterations = 200,
    istMaxResolution = 1,
  }