Timing information error in wikifonia dataset (e.g., wikifonia_103.jams)

[andreamust]

There is an error in the timing information for chord annotations in the wikifonia dataset, as seen in wikifonia_103.jams. The following example illustrates the issue:

"namespace": "chord_harte",
    "data": [
      {
        "time": 2.1,
        "duration": 4.0,
        "value": "G:7",
        "confidence": 1.0
      },
      {
        "time": 4.1,
        "duration": 2.8333333333333357,
        "value": "C:maj",
        "confidence": 1.0
      },
      {
        "time": 5.183333333333334,
        "duration": 1.1666666666666643,
        "value": "G:dim",
        "confidence": 1.0
      },
      {
        "time": 6.1,
        "duration": 4.0,
        "value": "G:7",
        "confidence": 1.0
      },
      {
        "time": 8.1,
        "duration": 1.0,
        "value": "D:7",
        "confidence": 1.0
      },
      {
        "time": 8.2,
        "duration": 1.0,
        "value": "G:7",
        "confidence": 1.0
      },