regression test temper-3.cir, temper sweep with 'temper' in a model parameter

* check invocation of CKTtemp() in DCtrCurv()
*   and for proper instance update in REStemp()

.model rtest r r='1000 + temper'
.model rfix  r r='1000'

v1  1 0  dc 5v

r_test  1 0  rtest

.control

let success_count = 0

dc temp 10 100 10.0

let val = -v(1)/i(v1) - 1000
let gold = "temp-sweep"

let err = vecmax(abs(val/gold - 1))

echo "Note: err =" $&err
if err > 1e-12
  echo "ERROR: test failed"
else
  echo "INFO: success"
  let success_count = success_count + 1
end

if success_count ne 1
  quit 1
else
  quit 0
end

.endc

.end