Table cell change broadcast

Tables have an option to send a BC whenever any cell in selected columns is
modified by any means. The bc sent includes the _row and _col of the
modified cell. The routine can use this information to update data,
summaries etc.

If a row/column/shift operation caused the change, then
_row may be 0 (indicating potentially all rows are affected) but _col
will always be properly set because separate broadcast will be sent
for each column with this feature selected.

In other words, a separate BC is not sent
for every cell modified but only for every column modified.

To use this feature:

• In the table editor, use the [Table]->Advanced->Recalculate Broadcast
  menu to select/add a broadcast.
• For each column that you want change notification, enable the
  "Send Recalculation BC" option.

The broadcast is sent to the dynamic scope of the table, with item
attributes _row and _col set as described above.

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idkbase note 20