#2287 When spliting long edges in mesh based simulations we now divide the longest edge first (searching globaly), this is more stable than what was there already. 

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18424 b5f69653-2bf5-0310-8201-b0dafb8e1405
Fixing Failing test from r18424 to do with #2287

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18427 b5f69653-2bf5-0310-8201-b0dafb8e1405