New metrics calc methods. Other minor changes.

Summary of main changes below:

- New metrics cal methods:
    - correlation_aware_euclidean (the new default)
    - haversine_plus_euclidean
    - haversine_plus_manhattan (the only one implemented previously)
- Add "unclusterable_data_columns" general config option
- Allow choice of HDBSCAN's cluster_selection_method
- Metrics has its own section in config file
- Support to weights for dists along proj x and y
- Used and visualised proj params more compatible
- Remove unused "tstep" from domain configs
- Fix a few crashes in outlier removal methods (addresses issue #5)
- Fix a few warnings
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