Simplify Time scalars and allow arbitrary dimensions.
Ensure EarthLocation becomes dimension agnostic.
Add tests for dimensions larger than 1.
Ensure datetime.timedelta only is multiplied with integers
(python2 cannot handle float)
Add documentation for higher dimensions, changelog entry
Merge pull request #3138 from mhvk/time-scalar-done-easy

Time scalar & multi-dimensional, using new ERFA