decription of Boston tracts

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@541 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tidy

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@542 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
decription of Boston tracts

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@543 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tidy

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@544 edb9625f-4e0d-4859-8d74-9fd3b1da38cb