Agglomcluster

Bug
- Fixed bug where graphs with integer nodes would sometimes generate damaged dendrograms

Improvement
- Fixed line-endings and added gitattributes for better cross-platform development

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Improvements
- Added cython compilation for speedup
- Refactored model into more intuitive design
- Removed redundant code paths/repeated copies

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Improvements
- Added ability to pass a uniqueness flag that forces all quality scores between clusters with the
flag to be 0.