refactored time statistic saving
clean up
testing
testing for set_time_increment
testing for set_time_range
allow unknown increment type
post rebase changes
review actions
review actions
review actions
move to different mock pattern
move from grib_set_long to grib_set
review action - handling truncation to ints
pep8
more grib_set_long to grib_set test changes
pep8
Merge pull request #1466 from esc24/timestat_save

GRIB support for saving time increment for time aggregated data (PDT4.8)