EROSION WITH GAUSSIAN
Macro: PROGSMERO
Function: Considering graytone of a point as the height, erosion can be seen as sliding the gaussian structuring element under all the points of the input image and for each point on the input image the origin of the gaussian is the point on output image. 
Parameters:
1. Parameters for the gaussian
-- amplitude.
-- std-deviation X axis.
-- std-deviation Y axis.
2. Input output image planes.
