added support for binomial coefficients n over k with k < 0
added support for binomial coefficients n over k with k < 0

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