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Fix external siegert neurons

Didi Hou requested to merge github/fork/AlexVanMeegen/fix_theory_siegert into master

Created by: AlexVanMeegen

As @jarsi noted, the mean-field theory predictions are off in the current version with NEST >= 2.18. This is due to a bugfix of the Siegert neuron in NEST which causes the external drive to produce undesired rates because its parameters, in particular the threshold, were not set properly. Fix: Adjusting the default parameters of the siegert_neuron.

@jasperalbers, @jarsi and myself (in particular @jarsi!) tested the new implementation across different hardware (laptops, JURECA) & software (NEST & GSL versions) setups and got consistent results with the old code and old NEST versions.

During the process, we found that the theory does not converge in the fixed point for the parameters as in Fig. 5 of the dynamics paper with the current dt, thus I also reduced it to dt=0.01 in the default parameters.

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