Update tests to match the reference tests

[mjpieters]

These commits bring the test suite up-to-date with the reference implementation.

To summarise, these 4 commits achieve the following:

• add tests since added to the reference implementation but were missing here
• add the draft RFC vectors (also added to the reference implementation test suite)
• add the names of the reference tests to each of the tests to make it easier to match these up
• remove a duplicated test; the exact same test is also part of the test_encrypt() parameters.

This should cover #7 and more.

[rlittlefield]

Awesome!