1D example cases could use improvement

[mikekryjak]

1D-Recycling is our main 1D example case, but it has some issues that could confuse new users:

• It uses PETSc by default which is not automatically installed by Hermes-3 when pulling the BOUT++ module
• It has a much longer nout/timestep than needed for convergence
• It doesn't have diagnose=true on several components, which may lead new users to think there are fewer diagnostics than exist

[mikekryjak]

We should also add the sound_speed component with electron_dynamics = false. This will ensure that the lax flux damping considers the combined species sound speed, not just each species' individual speeds. electron_dynamics = true also includes electron sound speed, but this should only be used if you're evolving electron momentum.

[mikekryjak]

Partially solved by #259