Speculative bug fix, TableBlock has static functions, no object.

When saving, delete_recursive tried to call down into an object.  That
object doesn't exist, and its trying to be recursive.  Instead have it
call it self statically.


git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/trunk/TableTool@8510 57e6efec-57d4-0310-aeb1-a6c144bb1a8b