Pyqrack

The `QCircuit` and `QCircuitGate` classes have been added to Qrack, (corresponding to `QrackCircuit` in PyQrack). `QCircuit` allows a (purely-unitary) definition of a circuit or subroutine, accepting an arbitrary `QInterface` state as input and giving the input state transformed by the `QCircuit` as output. (To include measurement in `QCircuit` routines, for now, split circuits into multiple sections and run measurement between them as desired.)

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**Full Changelog**: https://github.com/unitaryfund/pyqrack/compare/v1.8.4...v1.9.0

Compiling with GCC/G++12, we became aware that some of our std::unique_ptr instances for arrays had mismatched (non-array) deleters. This has been fixed, throughout the library.

**Full Changelog**: https://github.com/unitaryfund/pyqrack/compare/v1.6.3...v1.8.4

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There was unintentional "rectification" in the `LearnInternal()` method of (C++) `QNeuron`: if increasing the synaptic parameter improved the fit at all, then the case of decreasing the synaptic parameter would not be checked, even if turned out to be the better improvement.

Now, `QrackNeuron` always checks both branches and accepts the better of the two (or leaves its parameters alone if neither fit is better).


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By design of `QrackNeuron`, its output space space is that of a (controlled) rotation of a single qubit around its Pauli Y axis, which is therefore periodic. Compared to many applications of neural networks to classical data, this requires some special consideration.

Synaptic parameters ("angles") of `QrackNeuron` are now "clamped" to a period of 4 times "pi," to accommodate the overall phase factor of a rotation by 2 times "pi," given that `QrackNeuron` input qubits act of control qubits, so the overall phase factor becomes observable. (This has quantitative implications for activation functions.)

The `Generalized_Logistic` activation function has been adjusted to have ("sticky") poles at |+>, |0>, |->, and |1>. Perhaps a better convention will become apparent soon, but this seems to suit the developers' purposes for now.

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(I botched the last release:)

This fixes the `NeuronActivationFn` `Enum`, so that its values are integers rather than tuples.

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QrackNeuron` has been improved with the addition of several choices of activation function, with choice specified by an `enum`. (The documentation will be updated.)

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