re-start from conf file including RNG state is not consistent

[franticspider]

Need to write tests for this. I thought this worked back in 2016 but apparently not! It may be that long runs have features/bugs (e.g. memory leaks) that cause this...

[franticspider]

We need to make sure the following happens - with tests!

• RNG file is recorded even when a run is started from scratch
• RNG file reloads a run from any time point and runs forward reliably. if RANDSEED parameter exists in config it must be equal to the MTI parameter in the RNG file for this to work (check!)
• RANDSEED parameter overrides RNG file if both are present in config - with a warning.