updated files for release0.3.0

updated the about box to include the full GPL statement, previously
  missing and added the statement to the Oxygen icons, and removed
  the temporary message and command line usage message
updated the CommandLine class because it did not include the full GPL
  statement, just the copyright and warranty statements (which were
  left intact so as not to break the reqression tests)
updated the LICENSE file to include info about the Oxygen icons
updated the README file for the latest changes