Added the --no_beep feature

(cherry picked from commit e716cf4)

DDV/fluentdna.py

@@ -121,10 +121,11 @@ def done(args, output_dir):
     Otherwise system exit."""
     if args.run_server:
         run_server(output_dir)
-    beep()
-    hold_console_for_windows()
-    if __name__ == "__main__":
-        sys.exit(0)
+    if not args.no_beep:
+        beep()
+        hold_console_for_windows()
+        if __name__ == "__main__":
+            sys.exit(0)
 
 
 def ddv(args):
@@ -465,6 +466,10 @@ def main():
                              'Custom layout must be formatted as two integer lists of euqal length.\n'
                              'For example: --custom_layout="([10,100,100,10,3,999], [0,0,0,3,18,108])"',
                         dest="custom_layout")
+    parser.add_argument('-bb', '--no_beep',
+                        action='store_true',
+                        help="Don't make a beep sound when a job completes.",
+                        dest='no_beep')
     parser.add_argument('-n', '--update_name', dest='update_name', help='Query for the name of this program as known to the update server', action='store_true')
     parser.add_argument('-v', '--version', dest='version', help='Get current version of program.', action='store_true')