__Preliminary__ release *featuring*:
* A C API for forthcoming bindings.
* A standalone executable with inputs from a JSON data card.
* Three run modes:
* Classical Forward Monte-Carlo
* Backward Monte-Carlo, where one samples exclusively a given final state.
* Grammage scan of the geometry.
* A spherical Earth, with the PEM core, US standard atmosphere, but **without** topography.
__Warning__: multithreading support is **not** yet completed.