Small changes to the build script

CHANGELOG.md

Makefile.am

configure.ac

example/Numerics/PSE/0_Derivative_approx_1D/main.cpp

example/SE/0_classes/Makefile

openfpm_data

openfpm_devices

script/discover_os

script/install_MPI.sh

src/Decomposition/CartDecomposition.hpp

src/Decomposition/CartDecomposition_unit_test.hpp

src/Decomposition/ie_loc_ghost.hpp

src/Decomposition/nn_processor.hpp

src/Grid/grid_dist_id_unit_test.hpp

src/Vector/vector_dist.hpp

src/Vector/vector_dist_key.hpp