Pgext

* NEW - filters.pixelize
* minor improvements

* NEW - color.multiply
* NEW - filters.noiseBlur
* blur, hvBlur - optimization; fixed surface edge blur
* optimization

* color.alphaMask - method attribute (use mask.value or mask.alpha)
* filters.gradient - RGBA gradients

* NEW - filters.scratch
* filters.shadow - fixed target/source surface format
* deform module removed
* new testing image - Lena
* C code refactoring
* documentation refactoring

* New documentation

* NEW - color.alphaMask
* NEW - color.hue
* NEW - color.lightness
* minor improvements