Manually merge in 1.6.0 release date into the trunk ChangeLog, off from its branches/release_1_6 guise.
Manually merge in 1.6.0 release date into the trunk ChangeLog, off from its branches/release_1_6 guise.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@32096 d073be05-634f-4543-b044-5fe20cf6d1d6

danchr/macports-base,neverpanic/macports-base,danchr/macports-base,macports/macports-base,macports/macports-base,neverpanic/macports-base