Getting plastic synapses working in reimplementation of Brian backend
Removed the “u0”, “x0” and “y0” parameters from the `TsodyksMarkramSynapse` standard model, as they are really initial values, not parameters. A framework for setting initial conditions of synaptic plasticity models is currently missing, and should be implemented.
Implemented the correct version of the Tsodyks-Markram STP model in the Brian backend reimplementation.