st: decimal points/format using outsum command

[daphna bassok <dbassok@stanford.edu>]

I am using the outsum command to create various descriptive tables. 
The command is extremely useful.  However, I can't seem to figure out 
how to adjust the decimal places for the means and standard 
deviations.  I know with outreg there are options such as bdec and 
tdec to do this.  Is there something similar for outsum?

Many thanks! 
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