#2146 Binary attribute conversion utility

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20205 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2146 Fix r20205 (I am a grep master, but somehow I missed this mesh's use)

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20206 b5f69653-2bf5-0310-8201-b0dafb8e1405