upgrade to SparseSuite 4.4.1

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/matrix@3025 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
doxygen update

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/matrix@3026 edb9625f-4e0d-4859-8d74-9fd3b1da38cb