JPSSnagg

nagg_main.c:
    Hardcoded assumeing single file calling; added calls to nagg_get_granules;
    Turned off HDF5's automatic error printing.
    Still more work is needed.
nagg.h:
    added definitions of function return values (SUCCEED and FAIL). Can be used
    by all function with int return values.
    Added nagg_print_granules() prototype.
nagg_posix.h:
    Cosmetic change to error message.
nagg_get_granules.c:
    Removed unused FILENAME_SIZE macro.
    Changed function return type from herr_t to int.
    nagg_get_granules() returns SUCCEED and FAIL, instead of EXIT_XXX.

Tested: koala, linew. (syntax okay, segfault on actual run.)