Added Point comparison
DBSCAN complexity test
DBSCAN various optimizations inside expandCluster loop
DBSCAN Improved linear search with cached distances
DBSCAN improved cache!
Do not execute complexity (optimization) tests by default
Cluster calculates centroid of its points
DBSCAN added auxiliary getters
Created migration for DBSCANexecs results
DBSCANexecs started view
DBSCANexecs finished
DBSCANexecs increased memory_limit