added parser module to overview

Doc/lib/libpython.tex

@@ -31,6 +31,10 @@ different constraints).
 \item[imp]
 --- Access the implementation of the \code{import} statement.
 
+\item[parser]
+--- Retrieve and submit parse trees from and to the runtime support
+environment.
+
 \item[__builtin__]
 --- The set of built-in functions.
 

Doc/libpython.tex

@@ -31,6 +31,10 @@ different constraints).
 \item[imp]
 --- Access the implementation of the \code{import} statement.
 
+\item[parser]
+--- Retrieve and submit parse trees from and to the runtime support
+environment.
+
 \item[__builtin__]
 --- The set of built-in functions.