added fractional data

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/yuima@313 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed show method and set data

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/yuima@314 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed show method and set data

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/yuima@315 edb9625f-4e0d-4859-8d74-9fd3b1da38cb