gem/oq-commonlib — pull request #22 by micheles (2014-06-30 08:34:35+00:00)
Title: Given a proper ordering to BranchTuples

There was no proper ordering on the branchset, so the groupby was returning the results in a non-reproducible order. The consequence was random breakage of some tests in the engine: https://ci.openquake.org/job/master_oq-engine/1064/testReport/junit/openquake.engine.tests.input.logictree_test/LogicTreeProcessorTestCase/test_sample_gmpe/