update add command info to include dir support update mpd.1 and conf example to include ~ support git-svn-id: https://svn.musicpd.org/mpd/trunk@64 09075e82-0dd4-0310-85a5-a0d7c8717e4f
git-svn-id: https://svn.musicpd.org/mpd/trunk@28 09075e82-0dd4-0310-85a5-a0d7c8717e4f
git-svn-id: https://svn.musicpd.org/mpd/trunk@1 09075e82-0dd4-0310-85a5-a0d7c8717e4f