st: new/updated SSC content

[Christopher F Baum <baum@bc.edu>]

The command ssc whatsnew
or browse of
http://repec.org/docs/ssc.php
will reveal that there are 34 SSC packages that have been added and/or 
updated in the past month. The command and URL may be used at any time 
to check out what is new on the SSC archive.

Kit

*
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