Qctrl-open-controls

New updates in this package:

* Open Controls now supports Pyquil programs.
* Dynamic decoupling sequences can be exported to pyquil programs and run on Rigetti's quantum computers.
* A clear API for the package.
* Updates to naming of functions to make them more consistent.

This update adds support to Google Cirq and general improvements.

* Dynamical decoupling sequences can now be converted to Google Cirq circuits and sequences.
* Improvements to driven sequences performance.
* Typos fixed in example notebooks.

This update adds dynamically correctly gates as driven controls to the open control library. Driven controls are continuous drives on the transition of a qubit with variable detuning. Open controls provides a library of driven controls generated from dynamically corrected gate schemes. Dynamically corrected gates are robust to dephasing and/or control noise.

Q-CTRL Open Controls is an open-source Python package that makes it easy to create and deploy established error-robust quantum control protocols from the open literature. The aim of the package is to be the most comprehensive library of published and tested quantum control techniques developed by the community, with easy to use export functions allowing users to deploy these controls on

* Custom quantum hardware
* Publicly available cloud quantum computers
* The Q-CTRL product suite

The first release includes:

* Create dynamical decoupling sequences DDS from a comprehensive library of well-known schemes.
* Export a DDS for analysis on any of Q-CTRLs products.
* Export a DDS to a Qiskit Circuit to then run on any IBMQ devices.