#2507 Tidy code again, deal with todo, and add a const 'rGetLocation' method to 'ChastePoint'

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22054 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2507 Non-Euclidean caveat

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22055 b5f69653-2bf5-0310-8201-b0dafb8e1405