[rec.spad] corrected bug in the computation of nextval in evalRec

[kratt6]

Changes http://wiki.axiom-developer.org/RecSpad/diff
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??changed:
                 nextval := eval(next, argsym::F, 
-                                (len+1-(shiftInfo.max)::Integer)::F)
+                                (len-(shiftInfo.max)::Integer)::F)
                 newval := eval(nextval, op, 

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forwarded from http://wiki.axiom-developer.org/[EMAIL PROTECTED]