JPSSnagg

New feature: Recognize -S (simple output file format, aka Unpackaged format) as an option.  But the recognized option is not passed to the rest of the code yet.  
src/nagg_main.c
src/nagg.h
    added outfileformat to hold the output file format.
src/nagg_options.c
    Recognize -S and set outfileformat.
src/nagg_select_granules.c
    Mark the arguments of select_granules as IN or OUT types.
test/testnagg.sh
    Added test cases of -S. Since -S is only recognized but not passed to
    other part of the tool, only the debug statements main showed it is set
    correctly.

Tested: syntax passed.