WIP: adding a gaussian blur to the image
ENH: added a new function estimate_dist_center which will find the sample detector distance and calibrated center using other functions in calibration.py and image.py
TST: adding a test to the estimate_dist_sample
ENH: Added the Gaussian blur to the image added proc_funcs dict to the calibration.py
TST: added a function to check the proc_funcs in calibration.py
STY: PEP8 corrected