Hmm... Maybe we should switch to a modified blobdetector based on the
SimpleBlobDetector class. So:

larvablobdetector.cpp: Copy of the SimpleBlobDetector. With one minor
modification on the works. Planning to see if the contours can be saved.

Apart from that we will be happy if the "centroids" here called
KeyPoints are saved correctly.

Other changes include many memory fixes and some optimizations.