Delete of individual fails if individual has a child

[erwinwinder]

1) Add an individual (a) 2) Add an individual (b) with mother (a) 3) Delete (a):

REMOVE FAILED: remove(Individual) failed: Cannot delete or update a parent row: a foreign key constraint fails (omicsconnect.individual, CONSTRAINT individual_ibfk_2 FOREIGN KEY (Mother) REFERENCES Individual (id))

[mswertz]

This is, in my mind, exactly what we want.