bool OEIsStandardProteinResidue(OEHierResidue &res)
This function returns whether a residue represented by an OEHierResidue
is one of: ALA, ARG, ASN, ASP, CYS, GLN, GLU, GLY, HIS, ILE, LEU, LYS, MET,
PHE, PRO, SER, THR, TRP, TYR, VAL, ASX, GLX, CYX, CYH, HID, HIE or HIP.