Weibull scale and shape parameters swapped

[Muhali]

I'm not sure if this is a bug as it only affects naming conventions of the help text: The weibull functions have shape and scale parameters mixed up.

-- Function File:  weibull_cdf (X, SHAPE, SCALE)
     Compute the cumulative distribution function (CDF) at X of the
     Weibull distribution with shape parameter SCALE and scale
     parameter SHAPE, which is

          1 - exp(-(x/shape)^scale)

     for X >= 0.