Implement Jon's timer suggestion on #2520

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22370 b5f69653-2bf5-0310-8201-b0dafb8e1405
Use the Timer methods.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22372 b5f69653-2bf5-0310-8201-b0dafb8e1405
Tab-destroyer

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22375 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2520 inspired code reduction drive!

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22376 b5f69653-2bf5-0310-8201-b0dafb8e1405
oops

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22377 b5f69653-2bf5-0310-8201-b0dafb8e1405
more oops

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22379 b5f69653-2bf5-0310-8201-b0dafb8e1405