Nyall Dawson 5c2f68e769 [processing] Throw error when attempting to use Distance Matrix with
multipoint datasets

There's no single approach to use for multi-point inputs, so instead
of overloading this algorithm with extra options to control how these
are handled, we raise a helpful error and push the reponsibility back
to the user to get the data into the right format before running the
tool.

Fixes #20799
2018-12-15 10:36:44 +10:00
..