code: @Nullable
    public static FileOutputStream getOutputStream (@Nonnull final File aFile)
    {
      return getOutputStream (aFile, EAppend.DEFAULT);
    }
docs: Get an output stream for writing to a file.
  
  @param aFile
  The file to write to. May not be <code>null</code>.
  @return <code>null</code> if the file could not be opened