Pysight

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* Fixed some of the tests.

* Added option to save or discard photons arriving during the returning phase of a unidirectional scan. This is the default option now.

* Introduced ``Fill Fraction`` parameter that determines the amount of `time` the mirrors spend "inside" the image.

* Some tests are working again.

* Many other bugfixes.

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* Use ``Debug?`` to read a small portion of an ``.lst`` file.

* Changed defaults in GUI.

* Allows acquisition in bi-directional scanning mode. This is enabled with the ``Mirror phase`` and ``Flyback`` parameters in the GUI.

* Backend changes for possible future support of binary files.

* The code allows to dismiss unwanted input channels by specifying them as "Empty".
* If you mark a channel as containing data while it's inactive, an error will terminate execution.

* Massive refactoring of pipeline.

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* Bug fixes and improvements to TAG lens interpolation.

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* Changes to file I\O.

* Number of requested frames should actually matter now.

* GUI improvements.

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* Removed Dask.

* Refactored class structure, remove the ``Frame`` class.

* Refactored GUI code.

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* Added Dask ``delayed`` interface.