docs: private static void usage() {
              System.err.println("Usage:");
              System.err.print("java <options> ");
              System.err.print(DateTimeBrowser.class.getName());
              System.err.println(" <filename>");
              System.err.println("<filename> contains a list of Strings");
              System.err.println("\twhich are valid for DateTime instantiation.");
              System.err.println("<optons>");
              System.err.println("\t-Duse.time.zone=");
              System.err.println("\t\tA valid timezone name.  If not specified");
              System.err.println("\t\tthe OS/user default is used.  If sepcified");
              System.err.println("\t\tincorrectly, GMT is quietly used.");
              System.err.println("\t-Duse.view=");
              System.err.println("\t\tAn initial view to be displayed.");
              System.err.println("\t\tValid names are: getter, hex, date, cal");
              System.err.println("\t\tIf incorrectly specified, getter is used.");
              System.err.println("\t\tThis becomes the default view.");
      }