* Remove hard limit of processing 9 records. Processing will now stop
at first value outside of time range of interest
* Keep a list of all values within 2.5 minutes. Average this value to use
as the now value
* Don't change the now value date. Always use the time of the latest value
* Added new test for data spaced at 1 minute intervals, to mimic libre data from glimp
* Fix existing test results for average < 2.5 minute data. Deltas are different due to
not updating the now value time