added support to look for known functions and import their associated pvs...

added support to look for known functions and import their associated pvs libraries automatically, currently only have sqrt, but can add more as they come up

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/trunk/TableTool@6742 57e6efec-57d4-0310-aeb1-a6c144bb1a8b