New tests

[broquea]

New tests to increase high scores. Gurus can see all new tests, otherwise you can only see current and previous cert level tests.

[carrerasg]

It would be nice if the tests could be taken in any order.  I'm kinda stuck right now because of the lack of and ipv6 mailserver.

[broquea]

Cleaned up some of the newer questions for grammar as well as being more specific rather than general.

Also the NeWB->Enth->Adm->Prof->Guru are designed to be progressive not elective, gaining a new overall rank by completing the current level's requirements.