Feature proximity filter

[tedschmidt]

@jorishjanssen @RonaldOlsthoorn I tested this version and this doesn't fix the proximity issue since there is not a single noisy point but multiple. see image https://drive.google.com/open?id=1s7Ouerydb-FVPy6XNu8hl1nZJo0iUjxpFfQniXFg1Ew