pep8 and license header cleanup
pep8 and license header cleanup


Former-commit-id: 09ac1e60dd38c22c06e9e35864af5ad8b0472e15 [formerly 7e8d8b7cec576351f2010c8611a44e91a302102e] [formerly 7e8d8b7cec576351f2010c8611a44e91a302102e [formerly ee53a5e4a357c4e954858faa18204ad96a056962]]
Former-commit-id: 2fd1e893861d25add3002d45602040a1a60fb530
Former-commit-id: ead719139a908129157fb22c3cb1c7d838b75c16
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine