PRICE - image filtering and manipulation Code

fix bilinear scaling, when pixel distance is superior to 1px, it was wrong to keep it fix of 1px, instead it is the ratio of scaling

fix uninitialized size for GNUstep

make gaussian an inline function instead of a macro and thus check for special 0, 0 case

bump version

Remove alpha before saving JPEGs, may cause problems

fix memory errors

fix vertical centering during printing

center images on page

remove XPM type from the declared ones, GS doesn't actually support it

make initialization safer