Binarymap

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- Allow negative site numbers.

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- Added ``sites_as_str`` option to ``BinaryMap`` to enable non-integer site numbers (e.g., "214a").

- ``black`` formatting of code.

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- Gaps are now allowed in ``allowed_subs`` as a ``-`` character.

- Added ``AAS_NOSTOP_WITHGAP`` and ``AAS_WITHSTOP_WITHGAP``.

- Substitutions in ``BinaryMap`` now sorted according to input alphabet (before they were alphabetical).

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Added ``binary_sites`` attribute.

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Added ``allowed_subs`` parameter.

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Initial version of code ported from `dms_variants version 0.8.10 <https://github.com/jbloomlab/dms_variants/tree/0.8.10>`_.