removed some warnings, added rounding to ilSetAlpha and ilModAlpha
removed some warnings, added rounding to ilSetAlpha and ilModAlpha


DentonW/DevIL,bcampbell/DevIL,Agadoul/DevIL,DentonW/DevIL,bcampbell/DevIL,Agadoul/DevIL,Agadoul/DevIL,Agadoul/DevIL,bcampbell/DevIL,Agadoul/DevIL,DentonW/DevIL,bcampbell/DevIL,Agadoul/DevIL,DentonW/DevIL,DentonW/DevIL,DentonW/DevIL,bcampbell/DevIL,bcampbell/DevIL