ISimulatorTools used in the ISF are public tools in both jobs using the old style
SimKernel and jobs using the MT-compatible
SimKernelMT. This merge request makes the
ToolHandleArray<ISimulatorTool> owned by
SimKernelMT private. This has the side effect of changing the random number seeds used in these tools (as the seeding was based on the tool names). In order to mitigate this effect, the random number streams used by the tools are now seeded using a configurable stream name rather than the name of the tool.