st: Update to -estout- on SSC

["Jann, Ben" <ben.jann@soz.gess.ethz.ch>]

Thanks to Kit Baum, the -estout- package has been 
updated on SSC.

The -estadd- command now can compute a variety of 
descriptive statistics. (-estadd- is part of the 
-estout- package and adds extra results to stored 
estimates.)

To install the update, type

 . ssc install estout, replace

ben

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