Replaced the usage of zip files with gz and tar files, to avoid issues with the 4GB limit
Replaced the usage of zip files with gz and tar files, to avoid issues with the 4GB limit


Former-commit-id: f5ddceffd11b22a87d2f1dec6e4b0fee56b3ad9f
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine