Fixing the MAB skip function in 2+ dimensions. (westpa#436)

* Fixed bug in MAB skip function and refactored MAB code. Updated docs for MAB.

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* fixed linting and added some basic MAB tests

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* fixed linting

* further refactored code and wrote rigorous tests in higher dimensions

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* Update mab.py

fixed some undefined variables used in reporting

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* Update mab.py

* Update mab.py

* Small fixes and added MAB test ref data.

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* Fixed n_blockneck_filled tracker and updated MAB log bin boundaries.

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* Found and fixed another buggit add --all! Conceptually simplified special MAB bin assignment codee and refactored MAB tests.

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* removed unused import

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>