fixed toLatex

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/yuima@288 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
first stable release of yuima merits big version number

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/yuima@289 edb9625f-4e0d-4859-8d74-9fd3b1da38cb