* Add parameter to skip proximity bonding during PDB reading
* Test proximityBonding flag
* Remove multivalent Hs and bonds to metals in PDB
* Add tests for multivalent Hs and metal unbinding
* Remove covalent bonds to waters
* Test unbinding of HOHs
* Refactor funxtions
* Rename flag for cosistency
* Include flavor in double bond perception
* Add metalorganic test (APW ligand)
* Validate input foe IsBlacklistedPair and minor changes.