[Bug #729817] Document the rexec and Bastion modules as dead

Doc/lib/libbastion.tex

@@ -4,7 +4,12 @@
 \declaremodule{standard}{Bastion}
 \modulesynopsis{Providing restricted access to objects.}
 \moduleauthor{Barry Warsaw}{bwarsaw@python.org}
+\versionchanged[Disabled module]{2.3}
 
+\begin{notice}[warning]
+  The documentation has been left in place to help in reading old code
+  that uses the module.
+\end{notice}
 
 % I'm concerned that the word 'bastion' won't be understood by people
 % for whom English is a second language, making the module name

Doc/lib/librestricted.tex

 \chapter{Restricted Execution \label{restricted}}
 
-In general, Python programs have complete access to the underlying
-operating system throug the various functions and classes, For
-example, a Python program can open any file for reading and writing by
-using the \function{open()} built-in function (provided the underlying
-operating system gives you permission!).  This is exactly what you want
-for most applications.
-
-There exists a class of applications for which this ``openness'' is
-inappropriate.  Take Grail: a Web browser that accepts ``applets,''
-snippets of Python code, from anywhere on the Internet for execution
-on the local system.  This can be used to improve the user interface
-of forms, for instance.  Since the originator of the code is unknown,
-it is obvious that it cannot be trusted with the full resources of the
-local machine.
+\begin{notice}[warning]
+   In Python 2.3 these modules have been disabled due to various known
+   and not readily fixable security holes.  The modules are still
+   documented here to help in reading old code that uses the
+   \module{rexec} and \module{Bastion} modules.
+\end{notice}
 
 \emph{Restricted execution} is the basic framework in Python that allows
-for the segregation of trusted and untrusted code.  It is based on the
+for the segregation of trusted and untrusted code.  The framework is based on the
 notion that trusted Python code (a \emph{supervisor}) can create a
 ``padded cell' (or environment) with limited permissions, and run the
 untrusted code within this cell.  The untrusted code cannot break out
@@ -66,10 +58,6 @@ environments:
 \localmoduletable
 
 \begin{seealso}
-  \seetitle[http://www.python.org/doc/howto/rexec/]
-           {Restricted Execution HOWTO}
-           {Andrew Kuchling's tutorial on the use of the restricted
-            execution facilities in Python.}
   \seetitle[http://grail.sourceforge.net/]{Grail Home Page}
            {Grail, an Internet browser written in Python, uses these
             modules to support Python applets.  More

Doc/lib/librexec.tex

@@ -3,7 +3,12 @@
 
 \declaremodule{standard}{rexec}
 \modulesynopsis{Basic restricted execution framework.}
+\versionchanged[Disabled module]{2.3}
 
+\begin{notice}[warning]
+  The documentation has been left in place to help in reading old code
+  that uses the module.
+\end{notice}
 
 This module contains the \class{RExec} class, which supports
 \method{r_eval()}, \method{r_execfile()}, \method{r_exec()}, and