Distribute evidence when centroid is deleted
Add centroid in area of wide spread picked centroids
Extend letter experiment for tuning of addition and deletion of centroids
Merge pull request #11 from jswiergo/add-del-tuning

Addition/deletion of centroids tuning
comments
added ability to reset added and found subtrees from the tree miner.
fixed treemining timeshift to work when bottom layer is not 0.
added VideoWriter class to be able to write videos
fix compile error by linking math lib