Add more complex models of light/metabolism

[lawinslow]

Currently, it makes a linear assumption of the relationship between light and metabolism (GPP). Others have requested further functionality.

This will probably have to go into metab.mle, as most of the other models couldn't handle it, at least quickly or easily (kalman and bayes, maybe, but it would be a lot of work, ols and bookkeeping can't be changed).

[rBatt]

I think going down the route of representing different mechanisms in the model structure is a whole separate paper from what we started working on. Luke, you and I have had conversations about this in the past.

There are scores of alternative models one could explore. A group of people interested in this topic could write a review/ synthesis paper. Maybe going down this route would be LakeMetabolizer2?

[lawinslow]

Yeah, agreed. This is not for the paper. This was just a request from some people and I wanted to start thinking about where it would fit in the code so they could take on writing a simple implementation.