fixed pbm binary loading, removed a small ambiguity in file header parsing
fixed pbm binary loading, removed a small ambiguity in file header parsing


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