Finished the implementation of a "MD_interface" abstract class for future addition of different Molecular Dynamics engines. This required important changes to a significant part of the code. Optimizations to the MPI communications were also performed, therefore the minor version number of the software was incremented. **Download sources:** https://gitlab.inria.fr/parallel-replica/gen.parRep/tags/v1.1.0 or https://github.com/FHedin/gen.parRep/releases/tag/v1.1.0