Scipr

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* Fix for bug that would cause MNN to break if `k=1`
* Fix for mistake in SCIPR.transform_adata documentation about Returns
* More tests for matching algorithms added

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* New logging capabilities
- scipr API calls will no longer result in any output to stdout under normal conditions
- Instead, now using Python's built-in `logging` module to emit logging information
- Can also track SCIPR model fitting metrics per iteration in TensorBoard (optional)
* Now compatible with AnnData objects for fitting and transforming

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* First release on PyPI.