Add a view on the event_loss_data showing the tag and the rupture ids

[Michele Simionato]

This is useful when investigating an event based calculation.

CREATE VIEW riskr.event_loss_view AS
SELECT event_loss_id, b.tag, c.id AS rupture_id, aggregate_loss FROM
riskr.event_loss_data AS a, hzrdr.ses_rupture AS b,
hzrdr.probabilistic_rupture AS c
WHERE a.rupture_id=b.id AND b.rupture_id=c.id;