Minor improvments on DisplayBlob app. Add flag for depth map invertion
Minor changes
Switch from 1-norm to 2-norm for IMV evaluations. Use efficient algorithm
Minor changes
Merge branch 'master' into work2
Add new filter to Tracker class. Now, it's possible to reduce the
active blobs to the N blobs with the longest duration. Allows a robust
hand detection (see raspivid example app).