INF and -INF is now handled in solve_TSP.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tsp@766 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed vignette+release.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tsp@767 edb9625f-4e0d-4859-8d74-9fd3b1da38cb