Merge branch '463-urqmd-generate-zero-kinematic-energy-secondries-and-induce-wrong-energy-cut-counting' into 'master'

Book kinetic energy in ParticleCut

Closes #463

See merge request AirShowerPhysics/corsika!403

Add helper functions to create US standard atmosphere.

See merge request AirShowerPhysics/corsika!359

Merge branch '430-commutative-property-with-scalar-multiplication-is-not-supported-in-c8' into 'master'

Resolve "Commutative property with scalar multiplication is not supported in C8"

Closes #430

See merge request AirShowerPhysics/corsika!372

Resolve "Follow-up from "Add medium type, as new property (air, water, rock...)""

Closes #319

See merge request AirShowerPhysics/corsika!399

make conex module fit for multiple events. Added init function

See merge request AirShowerPhysics/corsika!385