+----------------+--------------+------------+------------+-----------------+
| 2.6.1 | 2.6 | 2008 | PSF | yes |
+----------------+--------------+------------+------------+-----------------+
+| 2.6.2 | 2.6.1 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
+| 2.6.3 | 2.6.2 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
+| 2.6.4 | 2.6.3 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
| 3.0 | 2.6 | 2008 | PSF | yes |
+----------------+--------------+------------+------------+-----------------+
+| 3.0.1 | 3.0 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
+| 3.1 | 3.0.1 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
+| 3.1.1 | 3.1 | 2009 | PSF | yes |
++----------------+--------------+------------+------------+-----------------+
.. note::
2.5.3 2.5.2 2008 PSF yes
2.6 2.5 2008 PSF yes
2.6.1 2.6 2008 PSF yes
+ 2.6.2 2.6.1 2009 PSF yes
+ 2.6.3 2.6.2 2009 PSF yes
+ 2.6.4 2.6.3 2009 PSF yes
3.0 2.6 2008 PSF yes
+ 3.0.1 3.0 2009 PSF yes
+ 3.1 3.0.1 2009 PSF yes
+ 3.1.1 3.1 2009 PSF yes
Footnotes: