Rename linear interpolator sub-package.
Fix minor typo
Correction to 1st fixed surface MDI check
Standardize Cartopy CRS imports.
Remove incorrect skip_data decorators.
Convert extract_overlapping tests to unit tests.
Merge pull request #1377 from rhattersley/fix-skip-data

Remove incorrect skip_data decorators.
Merge pull request #1375 from bjlittle/fixed-surface-mdi

Correction to 1st fixed surface MDI check
Merge pull request #1373 from bjlittle/fix-doc-string

Fix minor typo
Merge pull request #1376 from QuLogic/cartopy-import

Standardize Cartopy CRS imports.
Merge pull request #1378 from rhattersley/move-extract-overlapping-tests

Convert extract_overlapping tests to unit tests.
Add shape of earth 1 and 7
Move snapshot_grid and get_xy_dim_coords.
Remove circular dependency.

 - Move extend_circular_[coord|coord_and_data|data]
 - Duplicate _LINEAR_EXTRAPOLATION_MODES.
Merge pull request #1354 from bjlittle/shape-of-earth-1-7

Add shape of earth 1 and 7
GRIB2 GDT 4.
Review actions
Rebase and review actions
Merge pull request #1358 from bjlittle/grib2-gdt-4

GRIB2 GDT 4.
Merge pull request #1379 from rhattersley/tidy-interp

Break regrid circular dependency