Polyclonal

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- Add some options that generalize ``mut_escape_heatmap``, specifically:
* allow wildtype entries to be specified (with effects of 0) in ``mut_escape_df``. This helps allow additional tooltips.
* added ``max_min_times_seen`` and some tweaks to ``times seen`` tooltip
* added ``addtl_sliders_stats``

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- Add some options that generalize ``mut_escape_heatmap``, specifically:
* added ``epitope_label_suffix`` parameter
* added ``diverging_colors`` parameter
* changed ``percent_max_cutoff`` slider to work on real rather than absolute values and with non-zero minimum values.

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Initial release