st: -filelist- available on SSC

[Robert Picard <picard@netbox.com>]

Thanks to Kit Baum, -filelist- is now available from SSC and can be
installed using -ssc install filelist-.

-filelist- searches a directory and recursively all its subdirectories
for files and creates a Stata dataset with the file names and
directory paths of each file found. Specific types of files can be
targeted by searching for filenames using a pattern that conforms to
-strmatch()- (e.g. "*.dta").

-filelist- is very fast and can index very large directories. A
complete listing of Stata 13's 10K files takes less than a second on a
MacBook Air.

The help file for -filelist- contains an example of how to cycle
through each file in the dataset of files found.

This version of -filelist- is a much improved version of a program I
offered in the following post on Statalist:

http://www.stata.com/statalist/archive/2013-10/msg01058.html

in response to a request from Tim Evans:

http://www.stata.com/statalist/archive/2013-10/msg01014.html

The help file example is derived from the sample code that I posted
that shows a technique to loop through every observation of a dataset
that contains file names:

http://www.stata.com/statalist/archive/2013-10/msg01109.html

Robert
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