Move the cvc3generator package out of tablularexpression.

The cvc3generator package was originally put in tablularexpression while
I was fighting with maven.  Since it doesn't have to be in the package, remove
it to clean up the layout of packages.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10652 57e6efec-57d4-0310-aeb1-a6c144bb1a8b