#2410 get older CVODE behaving

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21353 b5f69653-2bf5-0310-8201-b0dafb8e1405
More documentation.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21354 b5f69653-2bf5-0310-8201-b0dafb8e1405
More documentation

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21355 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2410 oops

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21356 b5f69653-2bf5-0310-8201-b0dafb8e1405