pCorrect = ComputeWeibTAFC(x,alpha,beta)

Compute the value of a TAFC weibull psychometric function.
If ‘x’ is a matrix and the parameters are scalars, the same
psychometric function is applied to the whole matrix.
If ‘x’ is a matrix and the parameters are vectors, the
parameters are taken as applying to separate columns.

pCorrect = ( 1.0 - 0.5*exp( - (x./alpha).^beta ) )

9/15/93 jms Added some special casing to deal with matrix inputs
with/without vectors of parameters
8/26/94 dhb, ccc Handle weird values of alpha, beta
10/13/00 dhb Improve initial guess for alpha. Thanks to Duje Tadin
for identifying the need for this.

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