- Corrected the simple file parser (--fileformat simple) not working

  as exepected, now csv files should be correctly parsed, specify
  separators with --d ", " for example.

- Args behavior change: if --configfile is provided, the inline
  arguments are still taken into account and have the priority.

- Minor bug fix in the Args class (for the case where the same
  argument is provided more than once).

- Confusion matrix labels fixed.