#1660 acceptance test update

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18461 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2363 identify which cells need to change process and send them using `NodeBasedCellPopulation` communication methods.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18462 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2364 enable access to the list of halo nodes to send to neighbours.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18463 b5f69653-2bf5-0310-8201-b0dafb8e1405