MPI compiles and run. I do not know if the results are fine or not. There is still a problem when freeing memory when using multiple nodes.
Runs without memory problem but the energy is wrong for vdW and elec.
Merge branch 'experimental-mpi' into experimental-optim

Conflicts:
	include/io.h
	include/parallel.h
	src/init.c
	src/list.c
	src/mdbas.c
	src/parallel.c
Switched to cmake for building the software, and README updated for providing basic install instructions