Extended the migration rate calculation function to estimate an aggregated rate for people over certain age (slightly hacky but does the job, we can refactor it later if needed).
The age of aggregation is a variable given to the function.
The function still has the default option of treating each age group individually (if no age for aggregation is given).
The notebook 005 has been updated to reflect this new implementation on the emigration rate.
Closes #39
Extended the migration rate calculation function to estimate an aggregated rate for people over certain age (slightly hacky but does the job, we can refactor it later if needed). The age of aggregation is a variable given to the function. The function still has the default option of treating each age group individually (if no age for aggregation is given).
The notebook 005 has been updated to reflect this new implementation on the emigration rate.