Handle confusion between `occupants` and `residents` losses (fatalities, injuries, homeless) about oq-engine

[ptormene]

I assume with time_period @nicolepaul means the existing time_event parameter, that is avg by default, so we can always use occupants_<time_event>.

[raoanirudh]

• Homeless calculations always use the residents field
• Fatality and injury calculations use the relevant occupants field
  • occupants_<time_period> if a time_period is specified in the job configuration (scenario calculations)
  • occupants_avg otherwise

@nicolepaul can you confirm that at least the first item is resolved by #8972?

[nicolepaul]

• Homeless calculations always use the residents field

• Fatality and injury calculations use the relevant occupants field

  • occupants_<time_period> if a time_period is specified in the job configuration (scenario calculations)
  • occupants_avg otherwise

@nicolepaul can you confirm that at least the first item is resolved by #8972?

Yes, LGTM.

[nicolepaul]

I am including some test cases and their expected output here.

• scenario_damage
  • case_16a.zip
  • case_16b.zip
• scenario_risk
  • case_11.zip