Now GSL library requirement is removed



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mixvarselect@9 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
R Version 3.1.1 is required, package version 1.1


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mixvarselect@10 edb9625f-4e0d-4859-8d74-9fd3b1da38cb