Add some toString methods to help debugging.

Add some toString methods to aid debugging the operations setup.  It isn't
committed centrally as I'm not sure it is a good idea.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10843 57e6efec-57d4-0310-aeb1-a6c144bb1a8b