Review each KPI for patients in transfer

[mbarton]

Check each KPI, if it should include patients who have left the PDU

[anchit-chandran]

relates #631

[mbarton]

Thanks for the write up on #631 @anchit-chandran. I see that issue talks about KPI 1 (with KPI 5 already correct). Are there any other KPIs that need updating apart from 1?

[anchit-chandran]

KPI1 is used as the base query set for the other denominators so a change to this will have knock-on effects unless those other kpis also specify a filter for transfers.

From a quick ctrl f, almost all other denominators are affected as they use KPI1 for their base queryset: 2,3,4,8-12

The denominators are then used in all subsequent calculations.

In summary, the change would mean that if a patient has been marked as leaving a PDU (date+reason leaving service are filled), all data related to that Patient instance is filtered out of kpi calculations).