[CM] Snd 17.2

[bil at ccrma.Stanford.EDU]

Snd 17.2:

Tito Latini greatly improved the mix saved state info, and fixed many 
bugs.

in s7:
   let-set! now raises an error if the target variable doesn't exist
   if no result is specified, do returns the test result
      => works here as in cond and case, and multiple-values.
   in *rootlet-redefinition-hook* the first parameter is 'name, not 
'symbol.
   #e, #i, #d removed.  #i(...) is an int-vector constant, #r(...) a 
float-vector.

checked: sbcl 1.3.14, gtk 3.89.4

Thanks!: Tito Latini.