Remove many "versionchanged" items that didn't use the official markup,
but just some text embedded in the docs.

Also remove paragraph about implicit relative imports from tutorial.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 8704b7f..ae661ce 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -130,9 +130,6 @@
    added to the start of :data:`sys.path` and the ``__main__.py`` file in
    that location is executed as the :mod:`__main__` module.
 
-   .. versionchanged:: 2.5
-      Directories and zipfiles containing a ``__main__.py`` file at the top
-      level are now considered valid Python scripts.
 
 If no interface option is given, :option:`-i` is implied, ``sys.argv[0]`` is
 an empty string (``""``) and the current directory will be added to the
@@ -157,7 +154,7 @@
 
    Print the Python version number and exit.  Example output could be::
     
-       Python 2.5.1
+       Python 3.0
 
 
 Miscellaneous options
@@ -174,8 +171,6 @@
    If given, Python won't try to write ``.pyc`` or ``.pyo`` files on the
    import of source modules.  See also :envvar:`PYTHONDONTWRITEBYTECODE`.
 
-   .. versionadded:: 2.6
-
 
 .. cmdoption:: -d
 
@@ -216,8 +211,6 @@
 
    Don't add user site directory to sys.path
 
-   .. versionadded:: 2.6
-
    .. seealso::
 
       :pep:`370` -- Per user site-packages directory
@@ -432,8 +425,6 @@
    If this is set, Python won't try to write ``.pyc`` or ``.pyo`` files on the
    import of source modules.
 
-   .. versionadded:: 2.6
-
 
 .. envvar:: PYTHONNOUSERSITE
 
@@ -470,8 +461,6 @@
 
    If set, Python will print threading debug info.
 
-   .. versionchanged:: 2.6
-      Previously, this variable was called ``THREADDEBUG``.
 
 .. envvar:: PYTHONDUMPREFS