CALCULATE{"formula"} -- handle spreadsheet calculations outside tables

• The %CALCULATE{"formula"}% variable is handled by the SpreadSheetPlugin. There are around 80 formulae, such as $ABS(), $EXACT(), $EXISTS(), $GET()/$SET(), $IF(), $LOG(), $LOWER(), $PERCENTILE(), $TIME(), $VALUE().
• Syntax: %CALC{"formula"}%
• Examples:
  • %CALC{"$EXISTS(Web.SomeTopic)"}% returns 1 if the topic exists
  • %CALC{"$UPPER(Collaboration)"}% returns COLLABORATION
• Note: The CALCULATE variable is handled inside-out & left-to-right like ordinary TWiki variables, but it does not support functions that refer to table cells, such as $LEFT() or $T(). Use CALC instead.
• Related: CALC, IF, IfStatements, SpreadSheetPlugin