st: Update to -estout- available from SSC

[Ben Jann <ben.jann@gmail.com>]

Thanks to Kit Baum, a new version of the -estout- package is
available from SSC. To install the update, type

 . ssc install estout, replace

 or use the -adoupdate- command.

Changes:

o The -estpost- command now supports -svy: tabulate- (one-way
  and two-way frequency tables for complex survey data). Stephen
  Jenkins encouraged this addition. Examples:

    http://www.repec.org/bocode/e/estout/estpost.html#estpost120

    http://www.repec.org/bocode/e/estout/estpost.html#estpost122

o String variables are now allowed with -estpost tabulate-.

See http://www.repec.org/bocode/e/estout/history.html for
further details on changes.

Ben
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