added ntreesGrid

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phrapl@170 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
changed default nTreesGrid

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phrapl@171 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
n0 bug fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phrapl@172 edb9625f-4e0d-4859-8d74-9fd3b1da38cb