changed pq_evaluate.cpp, so that the derivatives are evaluated correctly
changed pq_evaluate.cpp, so that the derivatives are evaluated correctly

kedingagnumerikunimarburg/Marburg_Software_Library,wavelet-and-multiscale-library/Marburg_Software_Library,wavelet-and-multiscale-library/Marburg_Software_Library,agnumerikunimarburg/Marburg_Software_Library