Backport source links from 3.x.

Existing links have been updated to use the new reST role.  In some
files, I have also made cosmetic changes to the header.
diff --git a/Doc/library/queue.rst b/Doc/library/queue.rst
index 654f07a..36ff346 100644
--- a/Doc/library/queue.rst
+++ b/Doc/library/queue.rst
@@ -9,6 +9,9 @@
    :term:`2to3` tool will automatically adapt imports when converting your
    sources to 3.0.
 
+**Source code:** :source:`Lib/Queue.py`
+
+--------------
 
 The :mod:`Queue` module implements multi-producer, multi-consumer queues.
 It is especially useful in threaded programming when information must be
@@ -24,11 +27,6 @@
 the entries are kept sorted (using the :mod:`heapq` module) and the
 lowest valued entry is retrieved first.
 
-.. seealso::
-
-   Latest version of the `Queue module Python source code
-   <http://svn.python.org/view/python/branches/release27-maint/Lib/Queue.py?view=markup>`_.
-
 The :mod:`Queue` module defines the following classes and exceptions:
 
 .. class:: Queue(maxsize=0)