st: Update to -moremata- on SSC

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

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

The update adds two new Mata functions:

 - histogram() returns histogram densities.

 - exactbin() returns data counts within specified 
   intervals.

To install the update, type

 . ssc install moremata, replace

ben

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