Add ability to compare the inputs and outputs between two runs

[aeisenberg]

In order to track changes over time, it will be useful to have some sort of mechanism to compare the inputs and outputs of two runs. Initial thoughts are that it will look something like this:

1. select two runs to compare
2. download the model inputs and model outputs for both runs
3. compare the inputs:

• pre params
• params
• input.json from the UI (just to make sure we are not accidentally comparing different runs)

4. compare the outputs:

• total deaths
• total cases
• peak daily deaths date
• peak daily cases date
• (if easy) number of peaks
• what else??

Notes:

• maybe a textual compare between the inputs is good enough, but need to sort them first
• maybe we want to end the run in an error if there is more than X% difference between the outputs