Add Drouet & Cotton (2015) GMPE including 2017 erratum
Add Drouet & Cotton (2015) GMPE including 2017 erratum


Former-commit-id: f766e0cbef66948fa880a916880b7d1a033d1faa [formerly f766e0cbef66948fa880a916880b7d1a033d1faa [formerly 39ab329c021e70cd49f84b3beb82d7b3549cd2c4]]
Former-commit-id: 6f6fdb9770e664634e1492299e4cb2c31e115ff7
Former-commit-id: 5565c2aa4b447f114bc14c8ce7a29d9c777fcac7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine