import lattice; as new R CMD checks warn

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1138 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1139 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
R-devel CMD check: need more explicit handling of namespace things we did not import

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1140 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
requireNamespace() needs string


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1141 edb9625f-4e0d-4859-8d74-9fd3b1da38cb