Add Wcns5z for ghmhd, add Enable options to LimitLorentz & FixConservatives

[nilsdeppe]

Proposed changes

Upgrade instructions

Need to add

    Enable: false # Only needed when not using Kastaun for recovery

(or true) to FixConservatives and LimitLorentzFactor in input files.

Code review checklist

• The code is documented and the documentation renders correctly. Run
  make doc to generate the documentation locally into BUILD_DIR/docs/html.
  Then open index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.
• The PR lists upgrade instructions and is labeled bugfix or
  new feature if appropriate.

Further comments

[ffoucart]

Seems fine to me; we'll just have to add the lower velocity to the WENO reconstructor's inputs.

[nilsdeppe]

I'm trying to find where in develop we have that input. Or is this something you're adding?

[ffoucart]

Oh, that's the change you made to all the reconstructors to allow the calculation of the sound speed. It's not in develop; we'll just have to make the change when we merge the sound speed changes.

[nilsdeppe]

Ah okay, yea that should be straightforward enough to update when we get there :)