Seg fault when storeTrajectories=1

[William Shields]

BDSIM is seg-faulting when storeTrajectories=1. The lattice I was using is attached.

The problem is that in BDSOutputROOTEventTrajectories, line 69 uses the LocateGlobalPointAndSetup method with the second argument being a null pointer. In that method in BDSAuxiliaryNavigator, on line 56, it attempts to get the unit vector from that variable (the null pointer), causing the crash.

I'm assuming that the second argument back in BDSOutputROOTEventTrajectories should be the momentum rather than a nullptr??

[Laurie Nevay]

Fix issue #195.

→ <<cset b472ac7ecf13>>