bin/openquake:
bin/openquake:

Added `--config-file` option, which sets the "OQ_CONFIG_FILE" envvar.
This allows the user to override select configurations with a custom config
file.


Former-commit-id: 7370eac695171690862a50c56f61f5123324211e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine