#1992 - fix memory issue on Boost 1.34.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@17772 b5f69653-2bf5-0310-8201-b0dafb8e1405
#1902 use `DistributedBoxCollection` in `NodesOnlyMesh`

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@17773 b5f69653-2bf5-0310-8201-b0dafb8e1405