Improve header
Improve header


Former-commit-id: a652b24087188f8e9ddc7b49751255f9b626b2ba [formerly 3123cc15fa3ce40a33399a401f329d4b3a465c96]
Former-commit-id: 4254085f24c18dc6404b68f6024844f071751237
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine