Mutual info test

[khuenm]

Description

Added some tests for MIToolbox on calculating mutual information between 2 vectors of ranks. This is used to make sure the new implementation in PR #5795 is correct.

Checklist:

• Make sure that you are listed in the AUTHORS file
• Add relevant changes and new features to the CHANGELOG file
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• Updated or added python bindings for changed or new classes. (Tick if no updates were necessary.)

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[cbielow]

Nice. Thanks!