Dms-variants

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Fixed
++++++
- ``plotCumultMutCoverage`` now has y-axis that extends from 0 to 1.

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Added
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- In ``CodonVariantTable`` plotting, by default do not label facets for library when just one library, and add ``one_lib_facet`` parameter to plotting functions.

- Made compatible with ``pandas`` >= 1.0

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Fixed
++++++
- Show estimates data frame for ``bottlenecks.estimateBottleneck`` doctest.

- Remove use of deprecated ``scipy.array`` for ``numpy.array``.

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Added
++++++
- The ability to fit **multiple** latent phenotypes in the global epistasis models. This adds the ``n_latent_phenotypes`` flag to ``AbstractEpistasis`` models, and changes calls to certain methods / properties of that abstract model class and its concrete subclasses.

- The concept of "bottleneck" likelihoods in global epistasis models, implemented in ``BottleneckLikelihood``.

- The ``bottlenecks`` module to estimate bottlenecks.

- Added ``AbstractEpistasis.aic`` property.

- Added ``globalepistasis.fit_models``

- Added ``MultiLatentSigmoidPhenotypeSimulator``.

- An equals (``__eq__``) comparison operation to ``BinaryMap``.

- Added ``n_pre`` and ``n_post`` attributes to ``BinaryMap``. This changes the initialization to add new parameters, ``n_pre_col``, ``n_post_col``, and ``cols_optional``.

Fixed
++++++
- ``BinaryMap`` objects can now be deep copied (they don't have a compiled regex as attributed).

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Added
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- The ``expand`` option to ``BinaryMap`` to have maps encode all possible characters at each site.

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Fixed
+++++
- Fixed bug in ``AbstractEpistasis.preferences`` with ``returnformat`` of 'tidy'. Previously the wildtype was set incorrectly for missing values.