new function exprApply

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mumin@309 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update package files and manual

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mumin@310 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tidied up the manual

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mumin@311 edb9625f-4e0d-4859-8d74-9fd3b1da38cb