(partially) changelogged what was done recently. Did I forget anything?
fixed single-table and multi-table inheritance which have relationships
Concrete is still broken in this regard. I had to remove the "select_table"
optimization of the multi-table polymorphic for that to work.
made each initialization step as a method on EntityDescriptor
reordered EntityDescriptor methods so that they are in the order they are
added setup_entities method to be able to setup only some entities and not
all of them together. This is not usable yet, as all entities are still
appended to the _delayed_entities list whether you want it or not.