Set allow_tape=None as default for TimeSeries.get
This PR modifies the defaults for TimeSeries{Dict}.get to include allow_tape=None (rather than False). This ends up doing the following
-
TimeSeries.findgets called withallow_tape=False, then -
TimeSeries.fetchgets called withallow_tape=None
This should minimise the requirement of using a tape, but should eventually get data to the user.