clashes failing to recognise H-bonds with explicit hydrogens

[Tristan Croll]

Easy fix. In clashes.py, line 176:

        if a.num_bonds > 0 and a.neighbors[0].element.name in negative:

should be:

        if a.num_bonds > 0 and a.neighbors[0].element in negative:

[pett]

Thanks for finding this and supplying a fix. I've applied your fix to the code.

--Eric