gem/oq-engine — pull request #1490 by micheles (2014-07-31 13:29:50+00:00)
Title: Db migrations

Implement a general mechanism for database migrations and change the script oq_create_db to use it.
See https://bugs.launchpad.net/oq-engine/+bug/1294566. Tests are running here: https://ci.openquake.org/job/zdevel_oq-engine/505