Moiptimiser

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* Specify which algorithm to use from the command line.
* Keep track of the number of solver calls and report in output.
* Bug fixes to (Tamby & Vanderpooten, 2020) implementation.

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* Specify python version to prevent failing documentation build on https://readthedocs.org/

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* Documentation and changelog changes that were missed in previous release.

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* New state of the art algorithm - two stage approach from (Tamby & Vanderpooten, 2020) - implemented and set as the default for the command line executable.

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* Implemented maximisation problem solving.
* Improved documentation.
* Improved testing suite.

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* First working version, using the (Ozlen et al., 2014) algorithm, for minimisation problems.