Test the checkerboard decomposition

When a user program a new lattice/model and provides a checkerboard decomposition, it would useful to have an automatic check of the validity of the checkerboard decomposition. I have a routine for that, which tests:

• Check that the memory allocation of List_Fam: the second size should be at least the maximum size of the families.
• Check for bond duplication in the family lists
• Check that every bond is present only once in the family lists
• Check that indeed every pair of families commute