Transform one or more je.stat.csv statistics files and
write the output to stdout. A set of column names is used to
specify the order and which columns are written to the output.
The utility is used to create an output file that is easier to
analyze by projecting and ordering only the data that is required.
Each user specified column name will either be a exact match of a
column in the file or a prefix match. In order to output the "time"
and all "Op" group statistics a column list "time,Op" could be used.
Multiple input files are processed in the order specified on the
command line. Duplicate column headers are suppressed in the output
when processing multiple input files.