Add cut_sphere.f90 from ABIN repository.

The old versions can be found in ABIN.git
from commit 8701872bbd86e0561ee5058743e5de5e1b62226d and older.
Add harmonic wigner samplig via MOLPRO.

Old versions can be found in ABIN.git
from commit 8701872bbd86e0561ee5058743e5de5e1b62226d and older.