Added a test-data.r file and a test-functions.r file.  Added suggests: testthat. Incremented the verson number and updated the date.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpo@15 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpo@16 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpo@17 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
New function edited.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpo@18 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpo@19 edb9625f-4e0d-4859-8d74-9fd3b1da38cb