* added cpu path to the rasterization stage (no barriers, no group-waiting and no local memory)
 * global range for the cpu path is #bins * work-group size (note that the work-group size is set to 1, which is a lot faster than the max possible 128 size ... for whatever reason; -> global range = #bins)
 * fixed dump mistake when setting the binner kernel range (always used the cpu path)
 * added the possibility to flag oclraster_output buffers as const for oclraster_programs (non-const in transform_program, const in rasterization_program)