Qsearch

Updated the definition of some gates to more closely match IBM Qiskit. Added some popular gates. Reworked objective functions to allow more powerful customization, while carefully maintaining backwards compatibility. Tightened the tolerances of the Ceres numerical optimization in the accompanying qsrs release.

This release has been uploaded to PyPi, along with the accompanying updates to qsrs.

This release fixes bugs in `Project` and `XXGate`.

It also adds `U1Gate`, which implements IBM's `U1` single qubit gate.

This release fixes a few bugs and adds support for a few new gatesets:

- `QubitCRZLinear`
- `QubitISwapLinear`
- `QubitXXLinear`

which are all similar to `QubitCNOTLinear` except they use different 2 qubit gates. These have been added for better integration with qiskit.

- Fixed a bug in `LEAPReoptimizing_PostProcessor` that could cause a crash
- silenced a spurious warning in LEAP

This release fixes a few bugs:

- misnamed argument in an example script
- the qsrs version was not bumped in qsearch's setup.cfg
- the reoptimizing compiler did not use the logging module for certain information, now it does

This release comes with some fixes (12, 13) and new qiskit importing code in `qsearch.integrations`