st: updated version of -xml_tab- is available from SSC

["Zurab Sajaia" <zsajaia@hotmail.com>]

Thanks you Kit Baum, updated version of -xml_tab- is available from SSC 
archives.

To install the updates, type. ssc install xml_tab, replace; or 
use -adoupdate-command.

Changes in this version include a new -noadjust- option and some changes 
in -fonts- and -stars-:

   > "adjusted" vs "not adjusted" t-statistics, p-values, significance : if 
results of some transformation are reported (i.e. marginal effects instead 
of point coefs) by default "adjusted" t-stats are reported/used for p-value 
calculations => t-stat=f(b)/sd_f(b). using option - noadjust- forces xml_tab 
to use original (unadjusted) estimates to calculate t-stat = b/sd_b

   > -fonts- option now is unique to a worksheet, so different font 
face/size can be used for each sheet.

   > -stars- now allows not only the numlist (cut-off p-s for *, ** and 
***) but list of pairs where first member of the pair is the symbol(text) to 
be used as a marker and the second is the significance level.

We would be thankful for any suggestions about the additional options and 
improvements in -xml_tab-.

Michael Lokshin and Zurab Sajaia 
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