[EfixQ] and potentiall tardis.calc.energy

[ambarb]

Efixed Q just uses the beamline energy, we don't have a way of keep tracking of the offset. It is too hard to correct.

Options:

• [x] make sure tardis.calc.energy / 1e4 is in the baseline
• [ ] think about putting plan arguments for energy shift in start document
• [ ] consider configuring tardis.calc.energy as a "normal" read attribute

@cmazzoli, I would like to get your perspective

[ambarb]

also fixed is reference the setpoint instead of the readback.