XSBench Version 18

This update introduces an option to run a simplified event based method using the "-m event" option. The event based simulation is an alternative to the default history based simulation. The main difference between the two methods is how parallelism is expressed and whether macroscopic cross sections lookups are independent or not. The event based model does not capture costs associated with buffering particle states, but is still useful for determining if there are benefits of the method on various computer architectures due to its very different style of parallelism.

See the CHANGES file for more details.