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.
Fix to license check logic
Merge handles string coords.
Updates to erroneous copyright years based on git history.
Fixed copyright date of an experimental file.
Merge pull request #486 from pelson/license_header_check

Fixed copyright date of an experimental file.
Merge pull request #475 from bjlittle/merge_strings

Cube merge string coords.
Merge pull request #487 from esc24/licence_fix

Fix to copyright licence check logic.
fixed netcdf save cubelist bug
Merge pull request #488 from cpelley/fix_netcdfsavebug

Fixed NetCDF saving of special case of CubeList.
Merge pull request #428 from rhattersley/constraint-speed

Add an optimisation for single valued coordinate constraints.
Update categorical coordinate names to match function names.
Warn on deprecated defaults and deprecate the aliased functions.