Now the indices of the filtered sites are stored in the ProbabilisticRupture table

The tests are running here: https://ci.openquake.org/job/zdevel_oq-engine/416

This is useful for information purposes (which sites are affected by the given rupture?) and also because it makes it easier to compute the GMFs directly from the ruptures: https://bugs.launchpad.net/oq-engine/+bug/1321681

PS: in addition, I am also storing the source model name in the table LtSourceModel, for info purposes.
PPS: on top, of that, now we are using the new GmfComputer from hazardlib