numpy array optimisation of _quadrant_area
Merge pull request #1319 from jkettleb/area_weight

Optimisation of iris.analysis.cartography._quadrant_area
Ignore/warn the data-cutoff time.
Merge pull request #1332 from rhattersley/grib2-data-cutoff-ignore

Ignore/warn the data-cutoff time.
Add support for grid definition template 1.