working on #25,  i am checking in something that doesn't quite work but is promising.  at this point,  output is being sent to a _temporary directory,  but it never gets copied to the permanent location,  which probably is because we're never committing the output,  something I'm afraid would happen.  No fear,  let's understand this one
get the OutputCommitter working for the main otuput path in PSE3,  the one that goes through the reducer.  One Q is does commit happen at the end of the map,  the end of the reduce or at both?