Rethink about minimum needs behaviour

[lucernae]

Right now we had several issues:

Problem

• Minimum needs is calculated pretty much like post processors but it is being defined as ResourceParameter
• Minimum needs have additional informations such as unit, but post processor does not. It is possible to add unit key in the field or in post processors
• Minimum needs can be configured by user. This makes their post processor needs to be created dynamically. But there are some minimum needs that is hardcoded such as hygiene packs and additional rice for pregnant woman. There is an ugly mix of having to nicely define post processors in definitions, or to have user able to configure it in minimum needs profile.

[lucernae]

Closing this.
These behaviour is accepted for now.