PRICE - image filtering and manipulation Code

use destination image properties, use unsigned indices, add casts to fix rounding on PPC

mac update for gaussian blur

update parameters on value change

finally implement gaussian function

implement boundaries wrapping and use intermediate image for h result convolution

remove hack

first rough implementation with sawtooth

add Gaussian Blur empty shell filter and controller

warning fix, NSImage is returned and is enough

check for nil before accessing method returing a struct