#2431 - add ReleaseNotes to docs and update version numbers.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21850 b5f69653-2bf5-0310-8201-b0dafb8e1405
Some comments on output file-handler (from debugging #2441)

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21853 b5f69653-2bf5-0310-8201-b0dafb8e1405