Add KeyData.train_index_bounds #704
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When using data with more than one entry per train, I find it sometimes convenient (and also regularly more performant) to use plain old ndarrays and have arrays lying around indicating the first and last index of a given train.
This PR adds a method
KeyData.train_index_bounds()to deliver this based onKeyData.data_counts(). I went with the traditionallabelledapproach, though I don't have hard feelings for that.