Merge pull request #6221 from RosettaCommons/roccomoretti/interactive_fix_h_sub_issues
[Foldit] Fix ligand editing issues.
Due to a change in the way ligand checking worked, some viable modifications were being rejected due to hydrogens falsely being counted in valency. We can skip the contribution of hydrogen to valency in the first time we run this check. (Hydrogen issues should be accounted for later on when we re-run the check.)
RELEASE NOTES: Fix issue where certain ligand modifications (like O->C->O) were being rejected.