Warn if set_onsite_coupling! is called for spin s=1/2
#319
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Quantum mechanics disallows single-ion anisotropy for quantum spin-1/2. This is because any Pauli matrix squared is the identity matrix. Sunny follows quantum mechanics, but it can be confusing to users who may be thinking of spins as classical dipole vectors. Print an informative error message if this situation is detected, and provide guidance about using
:dipole_large_sto reproduce legacy calculations.