code: function readFile (relpath, callback) {
  		var f = config.dataFolder + relpath;
  		fsSureFilePath (f, function () {
  			fs.exists (f, function (flExists) {
  				if (flExists) {
  					fs.readFile (f, function (err, data) {
  						if (err) {
  							console.log ("readFile: error reading file " + f + " == " + err.message)
  							callback (undefined);
  							}
  						else {
  							callback (data);
  							}
  						});
  					}
  				else {
  					callback (undefined);
  					}
  				});
  			});
  		}
docs: files