reorganize package in pkg/<subdirectory>

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@18 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
reorganize package in pkg/<subdirectory>

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@19 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
reorganize package in pkg/<subdirectory>

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@20 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
reorganize pkg structure

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@21 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
reorganize pkg structure

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@22 edb9625f-4e0d-4859-8d74-9fd3b1da38cb