[+BUGFIX] Extbase (Persistence): Fixed broken IRRE setups. The type of relation is...

[+BUGFIX] Extbase (Persistence): Fixed broken IRRE setups. The type of relation is now determined as follows: There is a relation only if there is a "foreign_table" defined. If there is a "MM" or "foreign_selector" defined, an intermediate table is/must be used to store the relation information. If there is a "foreign_field" defined, the relation information is stored in a field on the child side. If not, a CSV on the parent side is expected.