Add tarfile module

Doc/whatsnew/whatsnew23.tex

@@ -1473,6 +1473,10 @@ Sockets Library (SSL) support.
 \item The value of the C \constant{PYTHON_API_VERSION} macro is now exposed
 at the Python level as \code{sys.api_version}.
 
+\item The new \module{tarfile} module 
+allows reading from and writing to \command{tar}-format archive files.
+(Contributed by Lars Gust\"abel.)
+
 \item The new \module{textwrap} module contains functions for wrapping
 strings containing paragraphs of text.  The \function{wrap(\var{text},
 \var{width})} function takes a string and returns a list containing