K-nearest neighbour match+others

Hi,

I have found that in the  'src/detection/DescriptorMatcher.cpp' using the matcher_->knnMatch instead of matcher_->radiusMatch I have good detections of my objects and I added to the pipeline. (9a6390c)

I've also done the ratio test after the matching removing duplicate matches. (9a6390c)

Additionally I adapted the configuration file to launch the detector adding a parameter for the KNN matcher. (33e326b)

Other issue I've found is in the debug mode. Is always in False, but if you put the flag in True by code the windows don't open. I've added a 1ms waiter to close the windows and now it works. (ac5b1a6)


Edgar