Commit Briefs
run all kinds of tests via tests.sh/runtime
while there also change the dependency in the makefile: iri_test should be alone, not as deps of `data'.
re-add sha script; it's used in the Makefile
While there, use it in the tests too
rework the regression suite
The tests are still there, the suite is equivalent to the old one, but this one is better structured. The biggest annoyance I had with the old one was that it wasn't straightforward to test only a specific set of tests. It's still impossible, but it's way easier to do it now. This extract all the tests to their own functions. It's overall better in all possible regards.