Add deprecation advice to developer guide.
Add section 6 (bitmap) to new GRIB loader
GRIB2 load for GDT90 (space view).
refactored time statistic saving
clean up
testing
testing for set_time_increment
testing for set_time_range
allow unknown increment type
post rebase changes
Correction to variable name.
Account for codedValues only containing unmasked data
Refactor Grib save handling of grid templates, for clarity.
Pep8 fixes.
Review actions
Review changes
Further review actions
Review changes
Merge pull request #1456 from rhattersley/deprecation-docs

Add deprecation advice to developer guide.
Merge pull request #1463 from dkillick/grib2_bitmap

Add section 6 (bitmap) translation to new GRIB loader