Compile error for Geant4 9.6

[Jochem Snuverink]

For Geant4 9.6 we use G4GenericPolycone, which doesn't exist in Geant4 9.6:

/.../bdsim/src/BDSCavity.cc:9:32: fatal error: G4GenericPolycone.hh: No such file or directory

This needs to be protected, I will disable cavities for 9.6

[Laurie Nevay]

I propose we move to supporting only Geant4.10.0 and upwards. I think latest version plus one old version with a lag of a few months should be ok.

[Jochem Snuverink]

okay, I agree. I will update the code and documentation

[Jochem Snuverink]

drop support for geant4 9.6; fixes issue #111

→ <<cset 5a96cdc166c7>>