Still Alive

Still alive, and still working on Digamma/PreDigamma.

• Hydra has become a research implementation of Digamma, written in Digamma, that can run itself. It also is written in a style that allows it to be compiled with a preDigamma compiler.
• Eprime has been tossed in favor of Enyalios, which is smaller, has a better performance profile, and is easier to extend.
• Vesta is still alive & kicking as the reference implementation of Digamma proper, although Hydra may grow to fill that role. 
• The plan now is that all non-core development should be in Digamma/PreDigamma, and only the necessary items should be written in C.