This function includes 3 options to deal with overlaping circles by:
1. remove one circle of the two.
2. removes the smaller circle of the two. 3. kills both all overlaping circles.
This function was used in 'Detecting and Counting Objects with Circular Features' blog post: http://imageprocessingblog.com/detecting-and-counting-objects-with-circular-features/
Better description, links and acknowledge of submissions.
added options and better documentation.