fixed some incompatibilities with Meshlab obj file format

1) I've wrongly assumed that opengl uses radians. I've fixed the convention in Coord3d.rotate to match degrees

2) MeshLab creates object files that have only 1 space after f and some empty lines. I've added support to handle those.

3) the lweber commit somehow got in there when I merged back the original version. Not sure how to delete it ? Does it matter ?