Import Von's tests, with cleanups.

Makefile

tests/README

tests/TODO.txt

tests/aggregate-results.sh

tests/fake-editor-change-password.sh

tests/gnupg/pubring.gpg

tests/gnupg/random_seed

tests/gnupg/secring.gpg

tests/gnupg/trustdb.gpg

tests/setup.sh

tests/sharness.sh

tests/t0001-sanity-checks.sh

tests/t0005-init-failing.sh

tests/t0010-generate-tests.sh

tests/t0020-show-tests.sh

tests/t0050-mv-tests.sh

tests/t0060-rm-tests.sh

tests/t0100-insert-tests.sh

tests/t0200-edit-tests.sh