Add support for the enumeration into the generators with tests.

Add support for the generators to deal with enumeration types properly, along
with making sure they won't generate output for other types of operations.
Currently only addition is checked.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@11088 57e6efec-57d4-0310-aeb1-a6c144bb1a8b