#2518 - fix calculating CPU time used by a test, so it includes child processes too (as the direct process run is a shell).

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21511 b5f69653-2bf5-0310-8201-b0dafb8e1405
git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21512 b5f69653-2bf5-0310-8201-b0dafb8e1405