[dataimport] remove replace_sep parameter from massive store
It is unused since changeset efbbf1e93a04 "[dataimport] Properly escape
strings sent to COPY FROM"
for table, column in [
('transactions', 'tx_time'),
('tx_entity_actions', 'tx_uuid'),
('tx_relation_actions', 'tx_uuid')]:
repo.system_source.create_index(session, table, column)
commit()