zz: Our "Sum above" function wants a typed cell--

[Ted Nelson <ted@xxxxxxxxxx>]

Hi Andrew--

The "Sum above" cell we just did has one problem.
 As long as we don't have typed cells, we can't have a
 Result cell which recalculates.  Thus the cell is recalculated
 for each invocation, and we can't be sure if a cell already there
 just *happened* to be there or was the previous result,
 to be replaced.

Having a Result celltype will mean that the recalc
 puts a new result in the existing result cell, or creates a result-type
 cell if there isn't one already.

Best, T
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Theodor Holm Nelson, Visiting Professor of Environmental Information
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