Concatenate total track

+ handle server voicehint time removed, times with 3 digits

tests/format/Gpx.test.js

@@ -47,6 +47,11 @@ describe('voice hints', () => {
         let brouterGpx = read('2-locus.gpx');
         brouterGpx = brouterGpx.replace(/.0<\/locus:rteDistance/g, '</locus:rteDistance'); // ignore .0 decimal
         brouterGpx = brouterGpx.replace(/\n\s*<\/extensions>\n\s*<extensions>/, ''); // ignore (invalid) double tag
+        // ignore float rounding differences
+        brouterGpx = brouterGpx.replace(
+            /:(rteTime|rteSpeed)>([\d.]*)<\//g,
+            (match, p1, p2) => `:${p1}>${(+p2).toFixed(3)}</`
+        );
 
         const gpx = BR.Gpx.format(geoJson, 2);
         expect(gpx).toEqual(brouterGpx);