removal of require(tcltk) line items

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mdsgui@14 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
version up

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mdsgui@15 edb9625f-4e0d-4859-8d74-9fd3b1da38cb