Added oq.get_composite_source_model
Added oq.get_composite_source_model


Former-commit-id: 766de92f7ad68e954377125d58dee70fbb27f940 [formerly b64706b7e1c1aafa62954f44cc93d2103276dc02]
Former-commit-id: 7421725520d3233be07a90d1c6bf428ba852b8ee
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine