Parsing jcamp is too slow

https://cheminfo.github.io/nmr-displayer/#/SamplesDashboard/h26k5v1lw5s/cytisine2ddatacytisine2dhmbc-onlyjson

Parsing the jcamp takes the following time on chrome:
````
0: {action: "Before split to LDRS", time: 0}
1: {action: "Split to LDRS", time: 5314}
2: {action: "Finished parsing", time: 5800}
3: {action: "Finished countour plot calculation", time: 6122}
4: {action: "Total time", time: 6122}
```

On firefox:
```
0: Object { action: "Before split to LDRS", time: 0 }
1: Object { action: "Split to LDRS", time: 14 }
2: Object { action: "Finished parsing", time: 442 }
3: Object { action: "Finished countour plot calculation", time: 622 }
4: Object { action: "Total time", time: 622 }
```

Splitting LDRS is much slower in chrome. This is related to a `jcamp.split(/[\r\n]+##/);`.