WHERY-1: Make a very basic start on a GUI.
WHERY-1: Continue working on the tabbed design.
WHERY-1: Start working on document opening.
WHERY-1: Continue working on document opening.
WHERY-1: Make it possible to run queries from the GUI.
WHERY-1: Improve some terminology.
WHERY-1: Add output tabs to each script tab.
WHERY-1: Move the actions' runs methods into the MainWindow class itself.
WHERY-1: Add an errors sub-tab to script tabs.
WHERY-1: Make some improvements to the error table.
WHERY-1: Detect parsing errors in real time.
WHERY-1: Introduce DLFrontendError to represent problems that occur in the frontend phase of Datalog to RA compilation.
WHERY-1: Add a basic Datalog checker.
Merge pull request #1 from sgolodetz/whery1

Completed WHERY-1: Implement a basic GUI.