Export all the samples in an experiment

[homonecloco]

Currently, there is no (obvious) way to look at all the samples at the same time. It would be useful to export a JSON file with all the samples and their characteristics/factors. It would be better to have them as a CSV file, matching the columns which would allow to see if there are any inconsistencies. But the JSON would be enough to produce a quick and dirty parser that flags anomalies.