* Reading CIF files could fail if the symmetry operators were given
* The symmetry handling did not recognize hexagonal spacegroups without :H. Changed
so if the hexagonal group name has neither :H or :R, the hexagonal setting is
assumed.
* When finding the spacegroup from the symmetry operators, hard-coded to the P1 case
to avoid what seems like a bug in spglib.
* Enhanced to use the full International Tables HM name for spacegroups, translating
the input to that standard name.