(Only the first 10 of 39 ports in this commit are shown above. )
Remove expired ports:
2011-04-24 ports-mgmt/portmk: has not been kept up to date for > 6 months
2011-04-26 ports-mgmt/portsman: hardwires an ancient version of INDEX
2011-04-30 mail/kiltdown: upstream seems dead since 2001