Script-Fu -> ISO Noise Reduction

This is an adjustable script,
it acts a lot like a softening filter, but tries hard not to over-soften edges and detail.

ISO Noise describes a problem in digital photography: you can get highly contrasting color specs scattered over an image -- some spots just too light or dark... some too saturated...

Basically -- you can't shoot a digital cameral a 400 ISO and expect it to come out looking like a Kodachrome slide. This filter helps.

;  This script should be placed 
;  in the user or system-wide script folder.
;
;  Windows Vista/7/8/10)
;  C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;  or
;  C:\Users\YOUR-NAME\.gimp-2.8\scripts
; 
;  Windows XP
;  C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;  or
;  C:\Documents and Settings\yourname\.gimp-2.8\scripts   
; 
;  Linux
;  /home/yourname/.gimp-2.8/scripts