The wellModel is now persistent over the time steps,
with an update method called every reportStep/episode.
This allows the following simplifications:
1. move the wellState to the WellModel
2. add a ref to the ebosSimulator to the wellModel
3. clean up the parameters passed to the wellModel methods
4. move RESV handling to the WellModel and the rateConverter
5. move the econLimit update to the WellModel
since I has not figure out a way to detect/catch the singularity of the
matrix with UMFPack, currently, we only check the validity of the
results to make sure inf or nan not enter other part of the simulation.
It can easiliy results in assertion failure, and causes the running to
be terminated. After all, it mostly likely is a numerical issue
generated during the non-linear iteration process.
