moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).

count_error_rows: Allow input to be specified as last arg(s) in addition to as stdin

Added bin/count_error_rows to count distinct rows with errors in `map` error messages