| Returns list of all entities in order of population dependency.
From the population point of view, one entity absolutely
depends on the other when it has mandatory reference (one and only one) to the other entity.
Somewhat weaker dependency is when entity has a nonmandatory reference. Preferrably
entities are orders in a way where earlier entity does not depend on the latter ones at all,
however since entities may have circular non mandatory references some times this will not be true
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