JPSSnagg

src/nagg_main.c:
    should have sent number of sets of granules to start_write. Fixed. 
src/nagg_write_granules.c
    Added a debug statment only.
src/nagg_select_granules.c
    Added iet2utc to convert IET to UTC format.
    Added assignment to beginning_date, beginning_time, ending_time of
    filled granules.

Tested: dove--all passed except when a file will contain leading fill granule.
    Failure is probably in write_granules?