Delete an improper dihedral angle between atoms with the given indices. If the improper does not exist, does nothing.
- i (int) – Index of first atom
- j (int) – Index of second atom
- k (int) – Index of third atom
- l (int) – Index of fourth atom
- molid (int) – Molecule ID to delete from. Defaults to top molecule.
(bool) True if improper dihedral exists and was deleted