Adding q ratio priors to Casal2

Id like to get the casal functionality for q-ratio penalties transferred across into Casal2.
Personally, I’m only interested in the 2 qs version, which is on page 90 of the casal manual.
This was used in a previous orange roughy assessment, and would help in an upcoming bluenose assessment, where I have a series of CPUE indices that are split into time blocks because it is known that fishing technology or management changed, and impacted catchability.
Matt D

Please respond with a write-up of the proposed method in a draft document so that we can clarify how this new functionality would work. A good start would be documenting how this functionality is described and implemented in CASAL.