release notes update, build system tweak

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2381 a5045d30-4826-4484-9c7f-6e55a06ddc77
tag release

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2382 a5045d30-4826-4484-9c7f-6e55a06ddc77