3rd rc for dune 2.4
First release candidate for 2.4
Tag version 2.3.1.-rc1
Official beta2 candidate for release 2.3.
Branch for the couse in Heidelberg in March 2012.
Release tag for the dune-common 2.1.1 maintenance release
patch 6061 (spelling) merged from the trunk
foreported the real fix for the undefined macro problem
bugfix: dune modules do not contain a file 'autogen.sh'