Implement parsing for all important binary operators.

Binary ops now includes:
-
/
>=
<
<=
Unary:
-
YAY!

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10704 57e6efec-57d4-0310-aeb1-a6c144bb1a8b