Dms-tools2

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* Added `CodonVariantTable.from_simulation` method.

* Handle large facet plots in ``dms2_batch_bcsubamp`` & ``plotSiteDiffSel``

* Correctly handle missing output for individual samples in ``dms2_batch_*`` programs.

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* Added function to create `gpmap.GenotypePhenotypeMap` from `CodonVariantTable`

* Don't test `rplot` module, we now recommend `dmslogo <https://jbloomlab.github.io/dmslogo/>`_ instead.

* Work with version >=1.0 of `umi_tools`

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* Handle single sample groups in `dms2_batch_diffsel` and `dms2_batch_fracsurvive`

* added `utils.sigFigStr`

* make compatible with latest `natsorted`

* added `diffsel.df_read_filecols`

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* Fix to work with pandas 0.24 and newest regex

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* Bug fix to plotting mutation frequencies in `CodonVariantTable`

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* Enhancements to `codonvarianttable`, including simulating data with simulated latent / global phenotypes, and more plotting.