Bad unwind tests and missing break/return tests
Bad unwind tests and missing break/return tests

Added break/return error evaluation tests. Removed bad and impossible
unhandled unwind tests. Added note explaining why and commented out
tests
as placeholder for when we figure out how to test unhandled unwinds.

metaeducation/ren-c-test,rebolsource/rebol-test,rebolsource/rebol-test,metaeducation/ren-c-test