Set ".shot" attribute of Equilibrium when loading using io.compass.cdb()

[hetsko]

Currently, Equilibrium object loaded via pleque.io.compass.cdb() has .shot=0. This then causes further minor inconveniences such as the loss of this metadata when writing the equilibrium into a file, e.g. to_geqdsk(). While I usually depend on the filename to store this metadata (shot number and time) I feel like it would be nice to have this additional backup given that this is already a feature of the eqdsk format.

Proposal for fix:

Probaly just add something like

# Accessing `sig_ref` instead of parameter `shot` should handle cases when user uses `shot=None`
eq.shot = sig_ref.record_number

added just below

pleque/pleque/io/compass.py

Line 40 in a414deb

eq = read_efithdf5(data_ref.full_path, time=time)

Proposal for further investigation:

• Might be worth to look into the other io options (such as cudb) and how they handle the shot attribute, potentially fix them as well