st: Update to -logitcprplot- available from SSC

["Ben Jann" <ben.jann@gmail.com>]

Thanks to Kit Baum, an update to the -logitcprplot- package is
available from SSC. Most importantly, the update fixes the link to the
LIDAR data in the help file. To install the update, type

 . ssc install logitcprplot, replace

or use the -adoupdate- command.
ben
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