PROB_KS

       Return the significance of the Kolmogoroff-Smirnov statistic

       Returns the significance level of an observed value of the
       Kolmogorov-Smirnov statistic D for an effective number of data points
       N_eff.   Called by KSONE and KSTWO

       prob_ks, D, N_eff, probks

       D -  Kolmogorov statistic, floating scalar, always non-negative
       N_eff - Effective number of data points, scalar.   For a 2 sided test
               this is given by (N1*N2)/(N1+N2) where N1 and N2 are the number
               of points in each data set.

       probks - floating scalar between 0 and 1 giving the significance level of
               the K-S statistic.   Small values of PROB suggest that the
               distribution being tested are not the same

       Written     W. Landsman                August, 1992
       Corrected typo (termbv for termbf)    H. Ebeling/W.Landsman  March 1996
       Probably did not affect numeric result, but iteration went longer
       than necessary
       Converted to IDL V5.0   W. Landsman   September 1997

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