st: Survey commands for predxcat and predxcon

[Joanne Garrett <joanne_garrett@med.unc.edu>]

Also, thanks to Kit Baum for posting new survey command versions of 
predxcat and predxcon. They have been added to the SSC Stata modules and 
can be found at:

        http://repec.org/docs/ssc.php

Predxcat estimates and graphs adjusted means or adjusted proportions for 
categorical X variables from linear or logistic regression models, and 
predxcon does the same for continuous X variables. The survey versions 
are called:

  svypxcat  -- for predxcat
  svypxcon -- for predxcon

Also, predxcat and predxcon have been updated to use the current 
graphics capabilities, and have new options, including cluster( ) and an 
option to save results to a data file.


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