a crash with the libv4l capture code

modified features2d interface; added algorithmic test for DescriptorMatcher; added sample on matching to many images

made FLANN (and dependent on it code) build fine on Windows. Most of the changes are added CV_EXPORTS' into the class declarations and extern variables are turned into external functions (as a nice side effect the variables are now read-only)

fixed FernDescriptorMatch; optimized keypoint regions matching in detector/descriptor evaluation; added CalonderDescriptorExtractor to evaluation tests

renamed createDetector to createFeatureDetector

This was crashing my code:
    for( size_t i = 1; i < imagePoints.size(); i++ )
        objectPoints.push_back(objectPoints[0]);

Changed by:
objectPoints.resize(imagePoints.size(),objectPoints[0]);

Plus clean up on Qt code

added GridAdaptedFeatureDetector, PyramidAdaptedFeatureDetector and funcs to draw keypoints and matches

modified FernClassifier::train(); remove old RTreeClassifier and added new implementation CalonderClassifier; removed old find_obj_calonder and added new one