Add output.R script to compute policyCosts

Created by: johanneskoch94

Ok guys, here's the script. I don't have write access to the validation folder on the cluster so I couldn't recreate Björn's plots quite yet.. Maybe we should test the script there before merging.

Also Björn, the relative GDP loss doesn't appear here yet. Since I'm using remind::reportPolicyCosts to compute the other policy costs, I would add the computation there, if that's ok.

Let me know if there is something that should be changed/added!

PS: There is a funny little bug that I don't quite understand. Calling remind::reportPolicyCosts on the cluster only works, if I load the magclass package before (loading the remind package would also work of course, but it's slightly overkill). Locally, and theoretically, I don't/ shouldn't have to. Do you know what's going on here?

PPS: Here's an example output pdf, created with runs lying around in my output folder (completely nonsensical). Just to get an impression. PolicyCost.pdf