Override dataRoot option
Today's dataroot is composed by a pattern like: {dataRoot}/{proposal}/{beamlineID}/{sampleName}/{scanName} and then MetadataManager will replace these keys by the real values.
In order to make MetadataManager more flexible it was agreed to call startDataset with and without parameter.
startDataset (no parameter): then pattern is applied startDataset parentFolder : then pattern is not applied and dataset folder if composed by parentFolder + datasetName
Example:
startDataset /data/myProposal
Then MetadataManager will set the dataRoot as /data/myProposal/{datasetName}