run_tests:
run_tests:

Added a comment to test run script to explain suggested usage
for running the "short" version of the test suite.


Former-commit-id: a36107775bda7cc681c801c343cc463cbe1b1e1e [formerly c67ae0022d9919445b20f563f63f92399fc3ab7d]
Former-commit-id: 9d2448e5de86b21f521403c65ad9f224c37f8ce8
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine