Resolve status of Parameters.hydrogen_bonds

[speleo3]

Parameters.hydrogen_bonds is referenced (in unused functions) but not defined.

propka/propka/version.py

Line 187 in 5a00d05

return self.parameters.hydrogen_bonds.get_value(

propka/propka/group.py

Line 1408 in 5a00d05

if atom.element in parameters.hydrogen_bonds.elements:

This means that class version.SimpleHB and version.ElementBasedLigandInteractions are most likely not functional.

See also #52