Make simple_test_driver.sh better at cleaning up its temporary files
Fix bug which made test/base_mods/base-mods.sh always return success
Simplify test/test_mod by removing some dead code and writing the output directly instead of via an intermediate buffer.
Stop test/test_mod from putting tabs/spaces on the ends of lines, which are annoying if you're using git diff-index --check in a pre-commit hook to catch that sort of thing.
simple_test_driver.shbetter at cleaning up its temporary filestest/base_mods/base-mods.shalways return successtest/test_modby removing some dead code and writing the output directly instead of via an intermediate buffer.test/test_modfrom putting tabs/spaces on the ends of lines, which are annoying if you're usinggit diff-index --checkin a pre-commit hook to catch that sort of thing.