st: modify dstdize to save no of events in the return list

[Salah Mahmud <salah.mahmud@gmail.com>]

just wondering if someone knows of an easy way to convince dstdize to
save the number of events (the numerators of the rates) in the return
list.
As it stands, dstdize (*! version 1.5.1  30jul2008) saves the
following matrices:
                 r(se) :  1 x 2
                 r(ub) :  1 x 2
                 r(lb) :  1 x 2
                r(adj) :  1 x 2
              r(crude) :  1 x 2
               r(Nobs) :  1 x 2
r(Nobs) returns the denominator (the population size), but I can't
find the equivalent matrix for the denominators.

Many thanks,
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