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.

To install the update, type

 . ssc install estout, replace

All changes are related to the documentation. In 
particular, there is a new introductory help file 
called "estout_intro". Type

 . help estout_intro

after installing the package.

ben

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