function _fnGetMaxLenString( settings, colIdx )
	{
		var s, max=-1, maxIdx = -1;
	
		for ( var i=0, ien=settings.aoData.length ; i<ien ; i++ ) {
			s = _fnGetCellData( settings, i, colIdx, 'display' )+'';
			s = s.replace( __re_html_remove, '' );
			s = s.replace( /&nbsp;/g, ' ' );
	
			if ( s.length > max ) {
				max = s.length;
				maxIdx = i;
			}
		}
	
		return maxIdx;
	}
Get the maximum strlen for each data column
 @param {object} settings dataTables settings object
 @param {int} colIdx column of interest
 @returns {string} max string length for each column
 @memberof DataTable#oApi