Migration with interventions

[shainova]

@heqixin When I run simulations now, with: N_POPULATIONS=1, DISTANCE_MAT=[[1]], DIST_POWER=1 and IRS: IRS_IMMIGRATION_RATE_FACTORS=[0] The system does not rebound quickly to its original state. Now this can be just a result of the sets of parameters I use, but I don't think so.

So my question is if in the current version immigration from the pool still exists and if, once intervention ends, it kicks in again?