Syntax:BondDihedralAngle(Atom1, Atom2, Atom3,Atom4)
Description:Returns the dihedral angle in degrees of the angle defined by the four atoms.
The dihedral angle is the angle between two planes. The first plane is
defined by Atom1, 2 and 3. The second plane is defined by Atom2, 3 and
AtomN: XYZ coordinates of atom N.