Ensure ParticleBroker only returns vectors with same SimID
SimKernel(MT) receives a vector of particles from the broker, and in the non-MT case retrieves the SimID of the first particle, and then use that for all particles in the vector.
Sometimes this lead to particles being sent to the wrong simulator.
I have now added a check inside ParticleBroker to ensure that all particles in a vector have the same SimID.
Not sure how to test the code though! It runs, but naturally the results change. In theory, they should change for the better.
Edited by Benjamin Michael Wynne