asks whether q is pnz and gives inf,0,minf
This is correct, and works with simpsum:true, simpsum:false, and simplify_sum.
Similarly, sum(f(i),i,1,inf) always returns a nounform.
sum(f(i)+q,i,1,inf),simpsum => inf
(without asking whether q is pnz)
Same thing with simplify_sum.
Maxima 5.14.0 on GCL 2.6.8 Windows XP