Changelog: complete old data and cycle

We switched to detailed per-release Changelog some time ago, available
on the website.
Move the old Changelog for historical reasons.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Changelog → Changelog-2010

@@ -1,4 +1,4 @@
-0.9.31  not yet released
+0.9.31  2 April 2010
 
     Upgrade notices from previous versions.
     o On x86_64 the format of /var/run/utmp changed compared to previous