PRICE - image filtering and manipulation Code

optimize scale algortihm handling of corner cases

fix warnings and remove some debug logs

Fix destination offset with correct bytes per row

use NULL and not nil for pointer

handle edges by holding off last pixel value

filter up to the borders by mirroring the image

update interface

one single pass to treat borders, instead of several loops. Slighly slower, but more uniform and readable code

cast parameter

round to third decimal to compensate rounding errors while inc/dec stepper