cosmetics

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@913 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
parallelized 'approximate'

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@914 edb9625f-4e0d-4859-8d74-9fd3b1da38cb