add PolynomialBondType, PolynomialBendType, PolynomialTorsionType, HarmonicBendType and CharmmTorsionType. Need to refine the design and add document for them
BondType, BendType and TorsionType
Molecule, Atom, DirectionalAtom, RigidBody and StuntDouble classes get compiled
add initial version of Bond, Bend and Torsion.
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