code: function _fnMap( oRet, oSrc, sName, sMappedName )
  		{
  			if ( sMappedName === undefined )
  			{
  				sMappedName = sName;
  			}
  			if ( oSrc[sName] !== undefined )
  			{
  				oRet[sMappedName] = oSrc[sName];
  			}
  		}
docs: See if a property is defined on one object, if so assign it to the other object
  @param {object} oRet target object
  @param {object} oSrc source object
  @param {string} sName property
  @param {string} [sMappedName] name to map too - optional, sName used if not given
  @memberof DataTable#oApi