ensure that use of unique in splitVertices operates on a vector rather than matrix or array (#445)
ensure that use of unique in splitVertices operates on a vector rather than matrix or array (#445)

Fixes #443 by ensuring that use of unique in splitVertices operates on a vector rather than matrix or array
nimble-dev/nimble,nimble-dev/nimble,nimble-dev/nimble,nimble-dev/nimble,nimble-dev/nimble