JPSSnagg

With the additions below to nagg_main.c, one data granule and one geo granule will be written to 2 output files when this command is executed:
nagg -n 1 -t REDRO REDRO_npp_d20030125_t0728319_e0737011_b00014_c20111025170507204040_unkn_ada.h5 GCRIO_npp_d20030125_t0728319_e0737011_b00014_c20111025170507201941_unkn_ada.h5

start_write("REDRO_npp_d20030125_t0728319_e07290417_b00014_c20111202104707204040_unkn_ada.h5", "GCRIO_npp_d20030125_t0728319_e07290417_b00014_c20111202104707204040_unkn_ada.h5", pids, 1);
write_granules(granule_info[0]);
write_granules(granule_info[16]);

(granule_info[0] is the first data granule and granule_info[16] is the first geolocation granule in the input files.)

Tested on jam and koala.