#2382 remove blocking send/recv from `ObjectCommunicator::ISendObject` etc. by specifying a maximum buffer size.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18987 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2327 fix memory leak

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@18988 b5f69653-2bf5-0310-8201-b0dafb8e1405