Differences between CLI and GUI for Ensemble Smoother

[dafeda]

Ensemble smoother in CLI accepts --current-case and --target-case where --current-case is set to default by default, and --target-case is required.

The GUI accepts Case format only:

By default, running via GUI produces two ensembles; default_0 and default_1.

The CLI does not support "%d" so this will fail:

ert ensemble_smoother poly.ert --target-case 'hei_%d'

I suggest we replace Case format in the GUI with Prior ensemble and Posterior ensemble, and replace --current-case and --target-case with --prior-ensemble and --posterior-ensemble in the CLI.