Added options for file names.
Added options for file names.

* Options for file names allow specification of the columns of interest
  in files (keys, scores, labels).
* Options are parsed and checked but are currently ignored during
  processing.  They will not work until they are incorporated into
  improved file processing.
* Added function to parse and handle file options.  Parsing is via
  regular expressions.
* Added FileArgument which wraps a file name and its options.
* Wrote help for file options with examples.
* Updated copyright year in about string.

kboyd/Roc