This function re-initializes the simulation kernel returning it to the
same state as after NEST has started.
- all network nodes
- all connections
- all user-defined neuron and synapse models
are deleted and
- random generators
are reset. The only exception is that dynamically loaded modules are not
unloaded. This may change in a future version of NEST. The SLI interpreter
is not affected by ResetKernel.