Pygsti

Fixed

- Fixed the issue of weird ('\*',) line labels in circuit construction routines when used with multi-qubit notation circuits, e.g. (0,)-labeled circuits getting erroneous ('\*',0)-labeled circuits created.
- Fixed bug in optools.fidelity for special case of trace-reducing rank-1 ops.
- Now handling sqrtm failure in optools._hack_sqrt as a warning instead of assertion error.

Fixed

- adds compensation for a scaling factor in matrixtools.unitary_superoperator_matrix_log which would cause an assertion to fail in some circumstances.

Changed

- pyGSTi is distributed with the Apache License version 2.0, included in LICENSE.

Added

- framework for time-dependent models and continuously-parameterized gates.
- added support for simple Pauli-stochastic noise operators.
- new tutorials for: idle tomgraphy, drift characterization, time-dependent GST, simulating RB data, continuously-parameterized gates, building implicit models (updated with crosstalk-free and cloud-crosstalk constructions)

Changed

- revamped drift detection code
- expanded Circuit objects can include arguments and time durations.
- expanded ability to create implicit models (local- and cloud-noise models) makes this process easier and more intuitive. Related to this, the error generators of LindbladOp objects can more easily be constructed and modified.
- more robust support for different bases (adds a new hierarchy of basis objects).
- updated documentation and bug fixes

Fixed

- adds the package pygsti.extras.idletomography which was missing from setup.py.

Fixed

- fixes a bug in running GST (in evaluating the log-likelihood) when the data contains zero-counts for some/all of the outcomes of a circuit.