Add a run_start_time for regression and change the determination of
the reference / initial / seed state with temperature. The previous
code used a state at least 3 days before backstop tstart and at least
one hour before the last available telemetry. The new code uses a state
within 1400 seconds of the end of available telemetry (where the
available telemetry is limited by either real availability, backstop
tstart, or the new 'run_start_time' option).
Add a run_start_time for regression and change the determination of the reference / initial / seed state with temperature. The previous code used a state at least 3 days before backstop tstart and at least one hour before the last available telemetry. The new code uses a state within 1400 seconds of the end of available telemetry (where the available telemetry is limited by either real availability, backstop tstart, or the new 'run_start_time' option).