#2336 Increase chunk size from 1 entry to 128 in "time" dataset to fix "excessive memory usage when extending a large dataset" problem.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20407 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2132 Add a new tutorial to show how to get propagation in the (downsampled) Oxford rabbit heart, i.e. a realistic geometry with fibres.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20409 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2132 tidy up!

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@20410 b5f69653-2bf5-0310-8201-b0dafb8e1405