reorganize pkg structure

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@34 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
reorganize pkg structure

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@35 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
* improve package description (-> 0.5)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@36 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
-> 0.5

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/subgroup@37 edb9625f-4e0d-4859-8d74-9fd3b1da38cb