Add support for CryptoNight Ultra/Pico

[mtl1979]

CryptoNight Ultra/Pico is basically original CryptoNight with 1/8 iterations and 1/8 scratchpad (256 kB).
This algorithm is used by new coin Talleo using Variant 2 (Official website).

There is also CryptoNight Ultra Lite, which is also known as CryptoNight Turtle Lite, that has 1/2 AES mask compared to stock Ultra algorithm.

Different miners use different name for the algorithm, so Ultra and Pico are both same algorithm. It's also called "CryptoNight Turtle", because the "Lite" algorithm was first used by TurtleCoin before they switched to another algorithm.

[todxx]

I believe we support pico under the name cnv8_trtl.
This is the algo currently used by Iridium, right?

[mtl1979]

There is two different algorithms, like I explained on the initial post... Most mining software support the "Lite" variant, but not the full variant of the algorithm.