working tests for legion-based, single-launch variant using regions (but still data-serial) for kern1-multiple test

changes to using bracket notation instead of parenthetical notation in readers as this is what is supported by legion.  may require updating other test infrastructure in tests_c

reorganizes test directories a bit, also adds gold standard for single and multiple tests and adds scripts to compare solution.  to run, now: cd tests/tests_c; make clean; make; make test