Added a test for license checking of code files. Closes #454.
Merge pull request #477 from pelson/license_header_check

Added a test for license checking of code files. Closes #454.
Fixed copyright date on one of the tests.
Merge pull request #483 from pelson/license_header_check

Fixed copyright date on one of the tests.
Revised grib load+save: extra levels translation, and grib <-> cf phenomenon translation from metadata project.