Oflibnumpy

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- Minor bugfixes and documentation corrections
- Bibtex citation to use to acknowledge the authors added

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- Introduced functions that largely replicate functionality of flow class methods, but for NumPy array flow inputs
- Minor bugfixes (e.g. range_max calculation in :meth:`~oflibnumpy.Flow.visualise()`)
- Minor documentation corrections, addition of this changelog

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First full release