Fitter albedo fix

[ianan]

PR Description

Fixes #284 by changing the order in which the photon bin widths are applied when including the albedo correction to the photon model and folding it through the SRM to produce a count model. Instead of the photon spectrum being multiplied by the photon bin widths before being folded through the albedo matrix, this now happens to the SRM before being used to convert the photon spectra to counts.

Change implemented by adding photon bin widths to make_model, and if they are included new way of calculating used. All other inputs/output to make_model remain the same.

Also

• made the albedo component clearer in default plots (now a labelled plum coloured line).
• the albedo count spectrum is also stored/logged in plotter_info for separate plotting via fitter.plotting_info['spectrum1']['albedo_excess_count'].
• modified formatting of fit parameters in default plot to better match their scale (needed here or just a nice bonus?)

AI Assistance Disclosure

AI tools were used for:

• Code generation (e.g., when writing an implementation or fixing a bug)

[jajmitchell]

LGTM

[samaloney]

Eh looks good think just needs to be rebased with main to get the doc build to work.

[ianan]

Eh looks good think just needs to be rebased with main to get the doc build to work.

Is that something I need to do?

[samaloney]

@ianan I've rebase this on main so the doc should hopefully build now

[KriSun95]

LGTM too!