Well testing of gas lift wells

Assign a maximum ALQ value to each GLIFT producer when doing well testing
in beginTimeStep(). This allows the well to be considered open. Then,
later in the timestep, when assemble() is called, the full gas lift
optimization procedure can adjust the ALQ to its correct value.

It is also observed that in some cases when gas lift is switched off by
setting ALQ to zero, and later in the schedule is switched back on again,
it might not be possible to determine bhp from thp for low small ALQ values.
Instead of aborting the gas lift optimization, we should try increasing
ALQ until we get convergence or until the maximum ALQ for the well is
reached.

opm/simulators/wells/WellInterface.hpp

@@ -248,6 +248,10 @@ public:
 
     void checkWellOperability(const Simulator& ebos_simulator, const WellState& well_state, DeferredLogger& deferred_logger);
 
+    void gliftBeginTimeStepWellTestUpdateALQ(const Simulator& ebos_simulator,
+                                             WellState& well_state,
+                                             DeferredLogger& deferred_logger);
+
     // check whether the well is operable under the current reservoir condition
     // mostly related to BHP limit and THP limit
     void updateWellOperability(const Simulator& ebos_simulator,