Add more ways to specify parameter sets for the analysis

[ha0ye]

Since there are multiple steps to the full dynamic stability analysis, being able to load and save the configuration of parameters would be handy for reproducibility reasons. (Also, to make sure that the description in the paper matches the results presented.)

• create a data structure for the params
• include the params data structure with saved results
• use the data structure for the Portal and Maizuru example runs
• be able to read in the params from an external file (yaml or some other format? @juniperlsimonis might have some suggestions ~ portalcasting)