Multiple mod policy

[anna-abelman]

Updated run_policy functions and pred_prod_outputs. @Paul-Carvalho would you mind checking a few things before merging?

1. checking the marginal utility income error is working correctly for both console and gui
2. if the logit_zonal models are running correctly in the policy function... I get zero difference but no errors
3. check the code in the welfare supplementary table specifically the mean_total_welfare_loss column

*note - I can clean up the code after you review

[Paul-Carvalho]

@anna-abelman here's a few comments so far, but I haven't gone through everything yet.

1. The input label for selecting the marginal utility of income just says "Select for [model name]" but doesn't indicate that this input should be the marginal utility of income (the popup info says this but I think marginal utility of income should be in the name).
2. The error message for marginal utility of income doesn't work for me. I'm able to run the simulation with exp catch and distance (V1) as the marginal utility of income with "Income cost..." = TRUE. Also, when I select FALSE for "Income cost..." the app crashes.
3. The zonal logit policy function seems to be running ok, but the welfare function isn't working. Nothing is plotted for welfare. You can run the zonal logit in the master branch and compare outputs.
4. Welfare supplementary table looks good. But again nothing coming up for zonal logit.