Remove history page.
Add ability to have global pages.
Add get most recent value to db interface.
Add overview variables design document
Update overview page.
Ensure script code gets loaded on ajax load.
Show countdown clock since last refresh.
Make refresh period settable.
Add design document to get overview variables
white-space changes
consolidate in refresh_all function
Update variable interface, add delete button.
Add delete function
Add submit new variable function.