Document and sim test recruitment dev_vector options

Imported from redmine, Issue #49212
Opened by @RickMethot on 2018-05-11
Status when imported: In Progress

Find while working with Cole Monnahan that the dev_vector approach to the recruitment deviations does not perform well in mceval_phase().

Three alternatives:

1. ADMB developers find a fix;
2. deprecate use of the dev_vector and add a penalty to the mean deviation to keep it close to 0.0. Feasible because this mean covaries strongly with ln(R0).
3. add the mean deviation to ln(R0) before using ln(R0) in the spawner-recruitment relationship; need to be careful about effects on early and forecast recruitments and on recruitments outside of the dev range.