Time in partition `shubert-winterreise` is not consistent with duration

[andreamust]

Time annotation in the shubert-winterreise score partition is not consistent with duration. This bug applies to all JAMS files in the dataset. Example: schubert-winterreise-score_14.jams

First three observations from the example:

{
    "time": 1.0,
    "duration": 0.5,
    "value": "C:min",
    "confidence": 1.0
},
{
    "time": 1.05,
    "duration": 0.5,
    "value": "G:7/D",
    "confidence": 1.0
},
{
    "time": 1.1,
    "duration": 0.5,
    "value": "C:min/Eb",
    "confidence": 1.0
},

Here, it is easy to note that the time of each chord does not correspond to the time + duration of the previous one.