Command line options

[MSallermann]

I think it would be nice to have more command line arguments available. As far as i know, the only one we have currently is -f to specify the configuration file, as in

./spirit -f "path/to/input.cfg"

Arguments that might be useful:

• ./spirit -i "path/to/image.ovf" to initialise the system with a given image
• ./spirit -c "path/to/chain.ovf" to initialise the system with a given chain
• ./spirit --version" to print the current version
• ./spirit --info could maybe print information about the scalar type, Cuda/OpenMp, defects enabled etc.

Maybe there are more, that could be useful ...

[GPMueller]

• spirit --version is a must!
• spirit --help should be present in order to get all command line options

Maybe the config file command should be --cfg instead of -f.

We already have a command line parser, but I would suggest looking into replacing it with bfgroup/Lyra, which is used by Catch2.

[MSallermann]

Implemented with b3ce15ffc9d2b3ec8db898b93bd8db7e8d818310.