code: boolean isHorizontalSeparator() {
      	if (isAttribute(Chunk.SEPARATOR)) {
      		Object[] o = (Object[])getAttribute(Chunk.SEPARATOR);
      		return !((Boolean)o[1]).booleanValue();
      	}
      	return false;
      }
docs: Checks if this <CODE>PdfChunk</CODE> is a horizontal Separator Chunk.
  @return	true if this chunk is a horizontal separator.
  @since	2.1.2