Corrected an error in the subroutine calc_cellindex

Added the AGPL license

Corrected a bug for the SEE module

For the compilation with the SEE module

Improved the SEE module

Added the angular dependence of the IIEE yield

Implemented the secondary electron emission (SEE)

Added instructions to the README for compiling the libraries

Improved the energy distribution of electrons emitted by IIEE

Computes the right number of particles per MPI process

Added an indication in README to run the code on a cluster

Added the yield for IIEE with Neon

Added the yield for IIEE with Helium and Argon

Correction for compilation with cmake