Essential Spreadsheets

-Changed the way tables are built in the Builder and reflected that
change in the Lab format
-Tables are now stored much differently, not relying on XML at all
-A table is comprised of values and Javascript equations (beginning with
"=")
-Equations can be static or reference specific cells (get B1 by calling
Spreadsheet.B1) to manipulate that data
-Spreadsheets do a lot of stuff at the moment, but in a kind of clunky
way--that should be improved
-Minor bug and ux fixes