restructured library manual accordiung to functional group

Doc/libpython.tex

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+\chapter{Python Services}
+
+The modules described in this chapter provide a wide range of services
+related to the Python interpreter and its interaction with its
+environment.  Here's an overview:
+
+\begin{description}
+
+\item[sys]
+--- Access system specific parameters and functions.
+
+\item[types]
+--- Names for all built-in types.
+
+\item[traceback]
+--- Print or retrieve a stack traceback.
+
+\item[pickle]
+--- Convert Python objects to streams of bytes and back.
+
+\item[shelve]
+--- Python object persistency.
+
+\item[copy]
+--- Shallow and deep copy operations.
+
+\item[marshal]
+--- Convert Python objects to streams of bytes and back (with
+different constraints).
+
+\item[imp]
+--- Access the implementation of the \code{import} statement.
+
+\item[__builtin__]
+--- The set of built-in functions.
+
+\item[__main__]
+--- The environment where the top-level script is run.
+
+\end{description}