8.18.10 cropped_circular_gaussian(p,position,threshold=3):

cropped_circular_gaussian $<$ Timing: $<$ Utilities.py

    NAM: cropped_circular_gaussian
    DES: compute a cropped circular gaussian with intensity=1
         defined by the parameter p wihtin the position an a given threshold given in n*'sigma'
         position should be a list of 2 arrays of the same dimension defining the map