Pysight

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* Added an optional line frequency entry to the GUI.

* Refactoring of some parts of the validation tools.

* Small performance upgrade.

* Added an option to treat sweeps as lines.

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* Added the acquisition delay and "hold-after" times to the calculation of the the absolute time of each event.

* Decreased package size dramatically by deleting unneeded test data.

* All 34 tests of code pass. I'll try to keep it that way :)

* Added an extrapolation method to create fake lines when the line data is too corrupt to work with. This is done using
the new "line frequency" and "frame delay" parmaeters in the GUI.

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* Refactored the output-generating script, while changing the possible outputs of PySight:
* Summed tif.
* Full stack as tif.
* In memory - both stack and tif accessed through the ``movie`` object.

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* Fixed small bug with censoring.

* Added checks to see whether we need censor correction.

* Added tests for ``lst_tools`` - they should pass, much like ``file_io``'s tests.

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* Added metadata from ``.lst`` file to the saved ``.tif`` file. Variables saved:
* "fstchan"
* "holdafter"
* "periods"
* "rtpreset"
* "cycles"
* "sequences"
* "range"
* "sweepmode"
* "fdac"

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* Fixed ``.tif`` generation.

* Refactoring of ``FileIO`` (tests still pass).