db/models:
db/models:

Added functionality to filter GMFs by location when iterating over the GMFs in
a GmfSet.


Former-commit-id: fbd1b84170c0bbb13e48e24070e3c63d7013cb7a [formerly 2a10ab74d1c6afbd82191585267696edeed2e66c]
Former-commit-id: e03256cf73478cd9765c501bd5e6c4bc175a83ee
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine