Year of intervention

[dimitrasal]

The PR adds a feature where different policies can be implemented and the model predicts two plausible outcomes with and without intervention. In response to issue #196

[dimitrasal]

Need to discuss ways to:

1. generalise the intervention function to allow for different measures,
2. make the code less repetitive

[mmcleod89]

• No specific options code needs to be implemented as this is highly project specific
• Some simple intervention should exist for testing and demonstration purposes
• the intervention option should be able to be set in a yaml file, which would just be a number
• we should make a short tutorial explaining how to write interventions and alter aspects of the different modules

[mmcleod89]

Could add:

• bool flag for repeating the intervention function every time step (false by default)
• a function for resetting / changing the option which then causes the inteverntion code to be called again. (They would then need to add a call to this in the loop, which we can explain in the documentation.)