Replace Frame0 with Psd Monitor

[jl-wynen]

Bifrost does not actually have a frame monitor 0. But it does have a PSD monitor. This PR adjusts the domain types and names accordingly. Unfortunately, the current simulation files don't reflect this. But we don't use the monitors currently anyway.

But this should fix an nightly test, see https://git.esss.dk/dmsc-nightly/dmsc-nightly/-/issues/50 and https://git.esss.dk/dmsc-nightly/dmsc-nightly/-/merge_requests/153

[SimonHeybrock]

The (slightly older) file I have has 2 PSD monitors. Do we need PsdMonitor 1 and 2 (or actually 0 and 1 given the naming in the file)?

[jl-wynen]

The (slightly older) file I have has 2 PSD monitors. Do we need PsdMonitor 1 and 2 (or actually 0 and 1 given the naming in the file)?

What file is that? The coda files only have psd0.

I can add a 0 to the name if you think that makes it clearer.

[SimonHeybrock]

The (slightly older) file I have has 2 PSD monitors. Do we need PsdMonitor 1 and 2 (or actually 0 and 1 given the naming in the file)?

What file is that? The coda files only have psd0.

Some older simulation from Greg?

I can add a 0 to the name if you think that makes it clearer.

I think it would make sense anyway: Doesn't "PSD" just say what kind of monitor it is, but not which instance (even if there is only one)?

[g5t]

Bifrost does not actually have a frame monitor 0. But it does have a PSD monitor.

😞 The files produced in the nightly tests are not indicative of the real instrument.

BIFROST has four monitors (plus the post-sample Bragg diffraction 'monitor'). The primary-spectrometer beam monitors are represented in my simulations as the four frame_* entries. The first was removed from the NeXus Structure used by coda. The psd0 entry is a McStas approximation to one operation mode of the fourth monitor.

BIFROST monitor location	McStas component(s)	Coda name
after pulse-shaping choppers	frame_0	(missing)
between frame_overlap choppers	frame_1	NNN_frame_1
after bandwidth choppers	frame_2	NNN_frame_2
at end of guide	frame_3 and psd_0	NNN_frame_3 and NNN_psd_0?
next to analyzers outside of the vacuum tank	(missing)	(missing)

There is an active attempt to correct the NeXus Structure to ensure it matches reality.

[jl-wynen]

We use the Bragg peak monitor differently, so I would not include it in MonitorType.

Do you want to call them FrameMonitor{1..3}? Then I can simply remove the psd monitor in this PR.