Add test for the residues C API
Add test for the residues C API

chemfiles/chemfiles,lscalfi/chemfiles,chemfiles/chemfiles,Luthaf/Chemharp,lscalfi/chemfiles,Luthaf/Chemharp,chemfiles/chemfiles,lscalfi/chemfiles,lscalfi/chemfiles,chemfiles/chemfiles,Luthaf/Chemharp