Convert external links to internal links. Fixes #2010.

Doc/howto/advocacy.rst

@@ -265,7 +265,7 @@ the  organizations that use Python.
 **What are the restrictions on Python's use?**
 
 They're practically nonexistent.  Consult the :file:`Misc/COPYRIGHT` file in the
-source distribution, or http://www.python.org/doc/Copyright.html for the full
+source distribution, or the section :ref:`history-and-license` for the full
 language, but it boils down to three conditions.
 
 * You have to leave the copyright notice on the software; if you don't include

Doc/howto/curses.rst

+.. _curses-howto:
+
 **********************************
   Curses Programming with Python
 **********************************

Doc/howto/regex.rst

+.. _regex-howto:
+
 ****************************
   Regular Expression HOWTO  
 ****************************

Doc/howto/unicode.rst

@@ -277,7 +277,7 @@ Unicode result).  The following examples show the differences::
 
 Encodings are specified as strings containing the encoding's name.  Python 2.4
 comes with roughly 100 different encodings; see the Python Library Reference at
-<http://docs.python.org/lib/standard-encodings.html> for a list.  Some encodings
+:ref:`standard-encodings` for a list.  Some encodings
 have multiple names; for example, 'latin-1', 'iso_8859_1' and '8859' are all
 synonyms for the same encoding.
 

Doc/library/curses.rst

@@ -48,9 +48,9 @@ Linux and the BSD variants of Unix.
       Convenience function to ensure proper terminal setup and resetting on
       application entry and exit.
 
-   `Curses Programming with Python <http://www.python.org/doc/howto/curses/curses.html>`_
+   :ref:`curses-howto`
       Tutorial material on using curses with Python, by Andrew Kuchling and Eric
-      Raymond, is available on the Python Web site.
+      Raymond.
 
    The :file:`Demo/curses/` directory in the Python source distribution contains
    some example programs using the curses bindings provided by this module.

Doc/library/re.rst

@@ -65,8 +65,7 @@ and implementation of regular expressions, consult the Friedl book referenced
 above, or almost any textbook about compiler construction.
 
 A brief explanation of the format of regular expressions follows.  For further
-information and a gentler presentation, consult the Regular Expression HOWTO,
-accessible from http://www.python.org/doc/howto/.
+information and a gentler presentation, consult the :ref:`regex-howto`.
 
 Regular expressions can contain both special and ordinary characters. Most
 ordinary characters, like ``'A'``, ``'a'``, or ``'0'``, are the simplest regular