Install missing dependencies if needed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/geometry@129 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Updated roxygen2 docs

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/geometry@130 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Removed print() statement


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/geometry@131 edb9625f-4e0d-4859-8d74-9fd3b1da38cb