Main changes
- uncorrelated and independently distributed white noise generation for point and density mechanisms
- enabled by extending nmodl dialect and adjusting modcc (WHITE_NOISE block, stochastic solver method)
- SDEs are solved by Euler-Maruyama method (synapse collapsing disabled in this case)
- CPU and GPU backends responsible for creating random numbers using random123
- simulation takes a seed value
- bumped ABI due to addition of random numbers in ppack
Incidental changes
- builder pattern for simulation
- pimpl idiom supported by util classes