add progress reporting module
add progress reporting module


Former-commit-id: 88cfb5d82b3db3fead0d1720db03e41508188a94 [formerly 7fef952377dc048b53c8f644e71f394c451dbaa9]
Former-commit-id: 03c59d6ec6830a975f9d14b13d2e326e51a422b1
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine