Students who withdraw their proposal will now be removed from the ranker.
And therefore don't influence the ranking of other proposals anymore.
Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed
from query import *
from subqueries import *
from where import AND, OR
from datastructures import EmptyResultSet
__all__ = ['Query', 'AND', 'OR', 'EmptyResultSet']