
Default implementation for ui_channels should return stderr for the debug priority
and stdout for info.

Unfortunately, this change produces some odd behavior if a library client does not
provide its own ui_channels proc (every message turns into debug), but I can't figure
out why so I'm hoping others can take a look at it and correct the "glitch".

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@29223 d073be05-634f-4543-b044-5fe20cf6d1d6

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