remove unmaintained expired ports from news
2011-05-01 news/leafnode+: Upstream disapear and distfile is no more available
2011-05-01 news/pyne: Upstream disapear and distfile is no more available
2011-05-01 news/slurp: Upstream disapear and distfile is no more available
2011-05-01 news/unpost: Upstream disapear and distfile is no more available