[CM] Snd 22.6

[bil at ccrma.Stanford.EDU]

Snd 22.6

Mostly fixing bugs and making minor optimizations.

s7: (random-state) returns the current random-state object.
     copy can handle random-state objects (but in s7/gmp it's a no-op)

checked: sbcl 2.2.7

Thanks!:  Anders Vinjar