Commit modifs before release 1 (03/26/18)

examples/SPIN/bfo/in.spin.bfo

examples/SPIN/cobalt_fcc/in.spin.cobalt_fcc

examples/SPIN/cobalt_hcp/in.spin.cobalt_hcp

examples/SPIN/iron/in.spin.iron

examples/SPIN/nickel/exchange_fit_fcc_ni/exchange_fcc_ni.dat

examples/SPIN/nickel/in.spin.nickel

examples/SPIN/read_restart/Co_PurjaPun_2012.eam.alloy

examples/SPIN/read_restart/in.spin.read_data

examples/SPIN/read_restart/in.spin.restart

examples/SPIN/read_restart/in.spin.write_restart

src/SPIN/atom_vec_spin.cpp

src/SPIN/atom_vec_spin.h

src/SPIN/compute_spin.cpp

src/SPIN/fix_langevin_spin.cpp

src/SPIN/fix_langevin_spin.h

src/SPIN/fix_nve_spin.cpp

src/SPIN/fix_nve_spin.h

src/SPIN/fix_precession_spin.cpp

src/SPIN/fix_precession_spin.h

src/SPIN/pair_spin_exchange.cpp