Onset of first superimposed stimulus (Pulse) is always at t=0

[pausz]

When using superimposed stimuli, the parameter Onset of the first stimulus seems to be ignored an the Pulse starts at t=0.

Minimal configuration file to reproduce the error:

`

Time: 0.15 Deltat: 0.00001 
Nodes: 4096
Connection matrix:
From:  1  2 
To 1:  1  2  
To 2:  0  0  


Population 1: Excitatory
Length: 0.5
Q: 10
Firing: Function: Sigmoid Theta: 0.01292 Sigma: 0.0038 Qmax: 340
  Dendrite 1: alpha: 83 beta: 769
  Dendrite 2: alpha: 83 beta: 769

Population 2: Stimulation
 Length: 0.5
 Stimulus: Superimpose: 3
    Stimulus: Pulse - Onset: 0 02 Node: 2070 Amplitude: 2 Width: 1e-3 Frequency: 1 Pulses: 1
    Stimulus: Pulse - Onset: 0.05 Node: 2090 Amplitude: -2 Width: 1e-3 Frequency: 1 Pulses: 1
    Stimulus: Pulse - Onset: 0.08 Node: 1889 Amplitude: -2 Width: 1e-3 Frequency: 1 Pulses: 1

Propagator 1: Wave - Tau: 0 Range: 0.2 gamma: 30
Propagator 2: Map - 

Coupling 1:  Map - nu: 0
Coupling 2:  Map - nu: 1e-4

Output: Node: All Start: 0 Interval: 0.00001 
Population: 2.Q
Dendrite:
Propagator: 1
Coupling:   

`

Then in matlab:
`

nf_obj = nf.read('e-erps.output');
these_nodes = [2070, 2090, 1889];
[stim, ~] = nf.extract(nf_obj, 'Pop.2.Q');
figure(1); hold on
subplot(211)
plot(nf_obj.time, stim(:, these_nodes));

`

After the fix the output Pop.2.Q looks