code: public void addHeader(final String title, final char mark,
  			final Alignment orientation) {
  		final Header header = new Header(title, mark, orientation, this);
  		rows.add(header);
  	}
docs: Adds a header row to the table. can be used to give a table some title.
  
  <pre>
  addHeader(&quot;hello&quot;,'.',NiceTable.LEFT)
  would produce a row like
  ... hello ..........................
  {rows in here.}
  </pre>
  
  @param title
  the string to display as a header
  @param mark
  the mark to use for the rest of the column
  @param orientation
  the orientation of the header column.