Matt Dawson

Add TUV-x to CAM

3

This PR contributes to #757 by including TUV-x in the CAM build and introducing a TUV-x wrapper to allow CAM-Chem photolysis rates to be calculated in-line by TUV-x. @stacywalters @tilmes...

### What happened? I'm not sure if this is a bug or me trying to output too much data. This is what happened - a simulation failed and an out-of-memory...

Introduce in-line photolysis rate calculations from TUV-x

2

### What is the feature/what would you like to discuss? This enhancement would use [TUV-x](https://github.com/NCAR/tuv-x) to calculate photolysis rates. Science motivation: CESM currently uses a look-up table for photolysis rates...