Implemented extraction of non-spatial multisets (bags) of categories, and extraction and clustering of instances and boxes from them
- added FIS adaptor for non-spatial bags, implemented as maps from class id to frequency
- added an implementation of k-means, for types that can be regarded as embedded in some abstract clustering space
- added code to apply the above -- extract non-spatial bags, and hence ordered tuples of classes, and either print to disc or run k-means directly
Added utility class for timing method execution