Consolidate I/O methods more. Avoid PrintWriter with system-dependent line breaks in output.

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@511 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Make the simple eval classes runnable as programs

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@512 0d189622-dca1-7e23-9e30-e8815eb7bd2f