poor bond detection with hydrogens

[speleo3]

MolScript by default connects adjacent hydrogens, like on methyl groups. This can be seen in many figures on the RCSB PDB website, e.g.:

http://www.rcsb.org/pdb/explore/images.do?structureId=4RWC
http://www.rcsb.org/pdb/explore/images.do?structureId=1AY3
http://www.rcsb.org/pdb/explore/images.do?structureId=3fw1
http://www.rcsb.org/pdb/explore/images.do?structureId=4rwb
http://www.rcsb.org/pdb/explore/images.do?structureId=4p3r
http://www.rcsb.org/pdb/explore/images.do?structureId=2A31

Pull request #2 addresses this issue.