Release 1.3.0

This is mainly a maintenance and compatiblity release.

Release 1.2.1

* Bugfix: Crash when initializing discretized numpy-array controls (#79, thanks to @loganbvh)
* Bugfix: Corrected definition of co-states in Dissipative Qubit Reset example (#80, thanks to Alberto Castro)
* Update: Switched Testing and Documentation deployment from Travis to Github Actions (#82)

Release 1.2.0

-   Added: `via_midpoints` argument to `krotov.conversions.discretize`
    function
-   Changed: Controls and update shapes are now discretized in a way
    that ensures numerical stability ([#74][], thanks to [@zachmanson][]
-   Changed: Replaced `uniseg` dependency with `grapheme` ([#76][])

Note: due to the changes in the time discretization of the controls and
update shapes, this version will generally not reproduce optimization
results from previous versions to machine precision.

[#74]: #74
[#76]: #76
[@zachmanson]: https://github.com/zachmanson

Release 1.1.0

Release 1.0.0

* Update: Citation info now points to `SciPost paper <https://scipost.org/SciPostPhys.7.6.080>`_ (`#61`_)
* Added: parameters `col_formats` and `col_headers` to customize the output of ``krotov.info_hooks.print_table`` (`#65`_)
* Added: info-hooks now have access to the additional arguments `propagator`, `chi_constructor`, `mu`, `sigma`, `iter_start`, and `iter_stop` (`#66`_)
* Added: parameter `keep_original_objectives` to ``krotov.objectives.ensemble_objectives`` (`#67`_)
* Added: "Related Software" in the documentation
* Update: Documentation is now hosted on gh-pages_ and deployed by Doctr_ (`#68`_)

Release 1.0.0-rc1

Release 0.5.0

* Update: Documentation now contains all information from https://arxiv.org/abs/1902.11284v5
* Added: Allow to pass `args` to time-dependent control functions (`#56`_, thanks to `@timohillmann`_)
* Changed: Renamed ``krotov.structural_conversions`` to ``krotov.conversions``
* Bugfix: Crash when ``krotov.optimize_pulses`` is called with ``iter_stop=0`` (`#58`_)
* Added: ``krotov.result.Result`` is now exposed at the top level of the API, as ``krotov.Result`` (`#59`_, thanks to `@nathanshammah`_)
* Added: str-representation of ``krotov.result.Result`` now includes the total running time (`#60`_, thanks to `@nathanshammah`_)

Release 0.4.1

* Update: Documentation now contains all information from
  https://arxiv.org/abs/1902.11284v4 (`#54`_)
* Added: a PDF of the documentation is now available at
  https://github.com/qucontrol/krotov/tree/master/docs/pdf (`#52`_,
  thanks to `@TejasAvinashShetty`_)

Release 0.4.0

* Added: Support for Python 3.7
* Changed: The ``'shape'`` key in ``pulse_options`` was renamed to ``'update_shape'``, to further avoid confusion between pulse shapes and update shapes.
* Changed: The ``.adjoint`` property of ``Objective`` is now a method
* Added: Ability to not use QuTiP ``Qobj`` objects, but arbitrary low-level objects instead.
* Improved: Printing an ``Objective`` now uses internal counters and a symbolic notation to identify objects shared between different objectives. (#43)
* Improved: ``gate_objectives`` now takes into account if target states are (reshuffled) basis states and does not create unnecessary new copies.
* Bugfix: Two ``Objective`` instances that contain numpy arrays as controls can now be compared with ``==`` (#44)
* Bugfix: Custom attributes (such as ``weight``) are now preserved when copying an ``Objective`` (#44)
* Bugfix: Calling ``copy.deepcopy`` on an ``Objective`` now preserves control functions (#44)
* Improved: The ``Objective.mesolve`` and ``Objective.propagate`` methods can now receive arguments ``H`` and ``c_ops`` to override the respective attributes of the objectives. This make is easier to analyze perform a robustness analysis, where the result of an optimization should be propagated under a perturbed Hamiltonian.
* Improved: The ``print_table`` and ``print_debug_information`` info-hooks now flush their output buffers after each iteration. As a result, when writing to a file, that file can be watched with ``tail -f``.
* Changed: Redefine ``tau_vals`` as their complex conjugate, fixing a bug in ``chis_ss`` and ``chis_sm`` (#46)
* Bugfix: Correctly calculate ∂H/∂ϵ if ϵ occurs in H multiple times (#47, thanks to `@uiofgh`_)
* Bugfix: Correctly calculate ∂H/∂ϵ=0 if the specific ϵ currently being updated does not occur in H (#48)
* Added: Method ``objectives_with_controls`` for ``Result`` object.

Release 0.3.0

* Added: Preprint citation information (`krotov.__arxiv__`,
  `krotov.__citation__`, `krotov.__bibtex__`)
* Added: Ability to continue from a previous optimization (#26)
* Added: Parameter `out` to `print_table` info-hook
* Added: Parameter `finalize` to `Result.load`
* Added: Ability to dump optimization result every so many iterations
  (`dump_result` check-convergence routine)
* Added: `re-entrant` option for `DensityMatrixODEPropagator`
* Bugfix: Discretize controls to float values (#41)
* Bugfix: Fix overlap for non-Hermitian operators (#39)
* Bugfix: Interface for passing `tau_vals` to `chi_constructor` (#36)
* Added: function `above_value` for convergence check (#35)