Slightly cheeky fix to coverage, don't think it is worth generating a special test for this.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22691 b5f69653-2bf5-0310-8201-b0dafb8e1405
Little tweak to PyCML to get more info out into error messages.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22693 b5f69653-2bf5-0310-8201-b0dafb8e1405
doxygen update.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22694 b5f69653-2bf5-0310-8201-b0dafb8e1405