wsa accumulation in wavesim

tests/test_wave_sim.py

@@ -6,7 +6,7 @@ from kyupy import logic, bench, sim
 from kyupy.logic import mvarray
 
 def test_nand_delays():
-    op = (sim.NAND4, 4, 0, 1, 2, 3)
+    op = (sim.NAND4, 4, 0, 1, 2, 3, -1, 0, 0)
     #op = (0b0111, 4, 0, 1)
     c = np.full((5*16, 1), TMAX)  # 5 waveforms of capacity 16
     c_locs = np.zeros((5,), dtype='int')