Known lattice mapping

[xivh]

• expose lattice_isotropic_strain_cost and lattice_symmetry_breaking_strain_cost from c++
• add map_lattices_without_reorientation to perform a lattice mapping from a known parent to deformed child, e.g. after VASP relaxation
• did not change k_best for map_lattices in case the default value of None is needed somewhere else

[bpuchala]

For documenting optional arrays with a default, I've been using the convention

    transformation_matrix_to_super: typing.Optional[np.ndarray] = None,

With docs:

        transformation_matrix_to_super: Optional[np.ndarray] = None,
            An integer shape=(3,3) transformation matrix ...
            If None, :math:`T` is set to the identity matrix.
        

And then inside:

if transformation_matrix_to_super is None:
    transformation_matrix_to_super = np.eye(3, dtype=int)

Otherwise, I think the generated docs print the entire array in function signature.

[bpuchala]

Is this ready? It's marked as draft still.

[xivh]

Do you want me to add any tests?

[bpuchala]

@xivh Thanks! I merged this on my system and made some edits. I think the force pushes are making it not recognized the it is already merged, so I will close it now.