st: Update version of -tabmult- for SSC

[Minh Nguyen <congminh6@gmail.com>]

Thanks as always to Kit Baum, updated version of the -tabmult- package is
now available for download from SSC. Options for reporting other
statistics (mean, median, etc.) are now available in the module.

In Stata, use the -ssc- command to do this, or -adoupdate- if you
already have old versions of these packages.

 tabmult collects multiple two-way tabulation tables of frequency
     counts or percentages between each variable in the categorial
     (cat) varlist and each variable in the by varlist, and calculates
     averages for variables in the continuous (cont) varlist by
     categories of each variable in the by varlist. It also aligns,
     re-arranges, and saves Stata results directly into XML format
     that could be opened with Microsoft Excel or OpenOffice Calc.

Best wishes
Minh
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