#2488 Commit Jochen's patch which moves the target area of cells from the Nagai-Honda force class into individual cell data. 

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20992 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2488 Eclipse failed to see us add this to revision control

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20993 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2488 Fix r20992 for OSX clang compiler (and fix tabs)

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20994 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2488 Fix one tutorial to use area modifier

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20996 b5f69653-2bf5-0310-8201-b0dafb8e1405