Added module synopsis.

Doc/lib/libshutil.tex

 \section{\module{shutil} ---
-         High-level file operations.}
+         High-level file operations}
 
 \declaremodule{standard}{shutil}
+\modulesynopsis{High-level file operations, including copying.}
 \sectionauthor{Fred L. Drake, Jr.}{fdrake@acm.org}
 % partly based on the docstrings