Import Job: Added support for replace existing time series.
Charts / Signal Explorer: Added option to have split / shared tooltips on Time series charts. Split tooltips shows a separate tooltip for each time series on the chart, while shared tooltip shows a single tooltip with all time series included.
Data API: Added support for replacing existing time series when importing time series. This is equivalent to deleting the existing time series (including all its point-in-time history), before importing the new time series.