* examples/setup-env, examples/teardown-env: Test environment scripts.

* examples/rsa-verify-test, examples/rsa-sign-test: New test cases.

Rev: src/nettle/examples/rsa-sign-test:1.1
Rev: src/nettle/examples/rsa-verify-test:1.1
Rev: src/nettle/examples/setup-env:1.1
Rev: src/nettle/examples/teardown-env:1.1