Lcviz

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* Support loading, viewing, and slicing through TPF data cubes. [82]

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* Ability to create additional viewers. [94]
* Updates to use jdaviz 3.9. [68]

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* Clone viewer tool. [74, 91]

* Flux column plugin to choose which column is treated as the flux column for each dataset. [77]

* Flatten plugin no longer creates new data entries, but instead appends a new column to the input
light curve and selects as the flux column (origin). [77]

* Ephemeris plugin now supports passing floats to ``times_to_phases``. [87]

* Ephemeris plugin's ``create_phase_viewer`` now returns the public user API instance of the viewer
instead of the underlying object. [87]

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* Initial release of lcviz with support to import time-series light curves via lightkurve and
process them through binning, flattening, frequency analysis, and ephemeris plugins.