Adding some more server-side scripts for MASSIVE.
- On MASSIVE, the WebDAV Konqueror window is now automatically
closed when closing a VNC window without killing the VNC session.
- On the CVL Desktop, some code has been committed to do something
similar (unmount the GVFS-mounted WebDAV share and close the
Nautilus window), but it hasn't been properly tested yet.

- Fixed GUI threading bug in LoginTasks's shutdownReal.
  dialog.ShowModal() was being called outside of the main GUI
  thread, causing the Launcher to crash on Mac OS X.

- Fixed some punctuation errors / typos.