Define a group weigh event that has statistics about a group weighing, and optionally has an array of weights/IDs (we expect mostly this will just be weights or empty, but there's a case for animal IDs if they are returned by scales for a sample of animals in a group).
Added these group events to performanceURLSchema.json
Resolves #332
Also: Add icarGroupTreatmentCollection.json and add treatment group events to healthURLScheme.json.
Define a group weigh event that has statistics about a group weighing, and optionally has an array of weights/IDs (we expect mostly this will just be weights or empty, but there's a case for animal IDs if they are returned by scales for a sample of animals in a group).
Added these group events to performanceURLSchema.json
Resolves #332
Also: Add icarGroupTreatmentCollection.json and add treatment group events to healthURLScheme.json.