Vaggelis Papoutsis authored Jul 19, 2023 and Andrew Heather committed Dec 18, 2023

This provides a list of faces (can be internal ones) to act as
additional seeds for the wave algorithm. The default argument provides
an empty list, so the behaviour of patchWave should not change.

Useful in topology optimisation, for propagating the active design
variables from the seed faces to the interior, with a given number of
cells at a time.