Determine which variables need to be kriged and apportioned in final reporting

[leewujung]

The Matlab code contains multiple different options for kriging and apportioning different variables.

Our current understanding is documented in this block diagram:
https://docs.google.com/presentation/d/1FOr2-iMQYj21VzVRDC-YUuqpOP0_urtI/edit#slide=id.p1

The boxes highlighted in red have been implemented (despite questions such as #217, #42, #183).

The goal here is to determine which variables need to be kriged and apportioned in final reporting.

[leewujung]

Conclusion from meeting with RT on 2024/04/01:
We will stay with the red boxes in the slide that have already been implemented in Echopop -- kriged biomass and kriged abundance.

New question for 2024/04/15:
We found out that the kriged abundance apportioning in the matlab code does not apply the age bin mapping from the aged fish samples to the unaged fish samples, but this was done for the kriged biomass apportioning. Is it useful to apply the same mapping to get to equivalent outputs as the kriged biomass?

The new question is tracked in #224, so I'll close this now.