create model with many selectivity patterns

[k-doering-NOAA]

Need a model that runs many selectivity patterns. Give each fleet the same data, but different selectivity patterns.

[iantaylor-NOAA]

I created two models, selex_age_examples and selex_length_examples for a training at the 2013 CAPAM workshop on selectivity which are available in this folder (including copies updated to 3.30.16): https://drive.google.com/drive/folders/0Bzz9RuYPGPyiclFEbndtOXA4VGc.

I don't see a presentation associated with the training, just this outline Google Doc: https://docs.google.com/document/d/1jZdxk4wkhU1jx_aqZbIxq3KFvGPA3DbCGGkha6EbaGI/edit#

The selectivities each model had are shown in the figures below (from "figs" within that folder). In each case the selectivities were fit to the same data to illustrate how estimation of uncertainty changes under different functional forms. The set of selectivities in each case could easily be expanded or contracted.

Length-based selectivity patterns

Age-based selectivity patterns

[Rick-Methot-NOAA]

Outstanding. Let's build on this.
Seems that I duplicated some of this work when I developed the selectivity webinar about 3 years ago.