Reflected the change in commonlib
Removed an unneeded argument
Made sure that the TrtModels are built in a repeatable order, the ones with few sources first
Fixed the test hazard/event_based/case_5
Small simplification in compute_ruptures
Fixed a helpers.create_ses_ruptures
Cosmetic changes
Fixed an off-by-one error
Fixed the disagg/case_2 test, since the ordering of the TRTs changed
Merge pull request #1451 from gem/split-by-trt

Sent the tectonic region types with less sources first, and fixed an ordering bug in a QA test