Mitoviz

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* Add ``--labels-hf`` (``labels-hf=True`` in Python) options to include the HF value
in plot labels.

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* Move test images to separate subrepo.

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* Add ``mitoviz-base`` command to create base mitochondrial plots.

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* Implement interactive basic linear plots;
* Implement interactive split linear plots.

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* Add ``--interactive`` option to create interactive plots using plot.ly;
* Implement interactive basic polar plots;
* Implement interactive split polar plots.

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* Fix loci label positions on polar plots.