stop abusing command_exec filter/redirect arguments for build nice/jobs, and improve debugging output (https://trac.macports.org/ticket/15530)
stop abusing command_exec filter/redirect arguments for build nice/jobs, and improve debugging output (https://trac.macports.org/ticket/15530)

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@37503 d073be05-634f-4543-b044-5fe20cf6d1d6

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