H2 optimize tests

[pjstanle]

Gradient-free H2 optimization scripts running with most recent changes. Test for optimization script.

[dguittet]

This test has revealed that h2_setup_optimize.py has a seg fault on Linux / HPC. It ran fine on Mac though.

(/home/dguittet/.conda-envs/hybrid) [dguittet@el3 H2_Analysis]$ python h2_setup_optimize.py 
Segmentation fault (core dumped)

[dguittet]

For the documentation, please describe what the functions do, what assumptions they make, how they do it, what the design variables are.

Here are some examples of other optimization scripts with documentation:
https://github.com/NREL/HOPP/blob/merge_H2/examples/optimization/layout_opt/hybrid_optimization_problem.py
https://github.com/NREL/HOPP/blob/merge_H2/examples/optimization/layout_opt/hybrid_parametrization.py

[dguittet]

The seg faults may have to do with battery sizing where the power capacity is 0 but the energy is non-zero. This doesn't really make sense model-wise. Is the battery duration a fixed or a design variable?

[pjstanle]

I added doc strings to all of the functions in the optimization files. I also added a flag to check for zero battery capacity and changed the bounds in the GF optimization. Hopefully that will fix the seg fault issue.