First steps to port SpikeQueue (ignoring CSpikeQueue, weave and dynamic
delays for the moment)
Implement synapse functionality -- creating synapses is not implemented
(only a manual one-to-one connectivity via the connect_one_to_one
method), neither is setting delays or state variables (you can directly
go via S._delays and S._arrays, however)
Add an example showing the Synapses class at work