New CogVMs available

CogVM binaries as per VMMaker.oscog-eem.1299/r3336

Clarify how to specify variadic primitives in the Cogit's primitive table

initializer (it had confused me enough to cause a regression).

Fix the regression in genPrmitiveClass.

Implement the stream primtiives using genFastPrimFail

which should speed up the stream prims noticeably.