Merge of changes into develop/d54506a4.

build/Makefile

src/exchange_Fv.c

src/exchange_par.c

src/fd.h

src/freemem.c

src/globvar_struct.h

src/gradient_F.c

src/gradient_F_acoustic.c

src/hess_F.c

src/hess_F_acoustic.c

src/hess_apply.c

src/ifos3d.c

src/initmem.c

src/outhess.c

src/read_par_json.c

src/writepar.c

src/zero_hess.c

src/zero_invers.c