e.g. "n += abs(sign(value))"  or  "n += sign(cv::norm(value) > eps_64"

fix createOpticalFlowNeedleMap

Completed findHomography test (source data has type CV_32FC2). In plans add the same checking for vector <Point2f>.

Created perf tests for cornerHarris, cornerEigenValsAndVecs, goodFeaturesToTrack, adaptiveThreshold, HoughLines. 

fixing compilation on Windows (std::tr1::tie() is undefined), removing warnings (conversion int to float/double)