UGLY HACK for Riegl Extra Bytes support.

UGLY HACK for Riegl Extra Bytes support. When trying to read a LAS file from a Riegl camera, I ended up with wrong values and the point cloud. Since I'm in a hurry, I did this UGLY hack to get things going. Maybe others will find it useful to start processing Riegl LAS files while a "true" solution comes up.