Too Many Terms

[JonathonMisiewicz]

QForte heavily abuses the word "terms". It's used in quantum_operator to mean a scalar multiple of QuantumCircuit. It's used in sq_op_pool to mean a scalar multiple ofSqOperator. It's used in sq_operator to mean a scalar multiple of vacuum-normal, particle-conserving products of fermionic second quantized operators.

As a result, trying to read certain sections of the code has proven an interminable headache. The offending methods should be given more descriptive names. This is, of course, another very API-breaking change.