EXTRA: Set resource threshold for each camp, issue warning when fall below threshold (high priority)

[nghugo]

We have not defined thresholds for each resource yet.

Within each camp, we can dynamically calculate the threshold for each resource using the current camp population. Eg each person needs - 2 water packets, 1 food packet, 1 bedding packet, …

Whenever a resource amount falls lower than the relevant threshold, print a warning message on the screen. Resource amount can become lower than the relevant threshold when:

• New refugees are added to the camp, which raises the threshold
• A resource amount is set to a lower value (either by overwrite or increment/decrement)

[nghugo]

Re: Resources let's exclude the threshold for baby_packets because not every family has a baby (we don't record the number of babies in a family anyway). For all other resources, it makes sense to create a threshold. You can define the multiplicative factor as you see fit (positive integer)