st: New -tr- package on SSC: prefix command to trace program execution

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

Thanks to Kit Baum, a new command called -tr- is available from SSC.
-tr- is a prefix command to trace the execution of a Stata program.

To install -tr-, type

 . ssc install tr

-tr- works with Stata 8.2 or newer.

In essence, -tr- is a shorthand for typing

 . set trace on
 . <command>
 . set trace off

but it also supports all other trace settings as arguments/options.
For example, you can type

 . tr 3: <command>

to trace up to three levels of nesting, or you can type

 . tr, hilite("whatever"): <command>

to highlight all occurrences of "whatever" in the trace output. See

 . help tr

for details.

ben
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