Table Driven Entries and Dynamic Table Columns

Table driven entry will no longer cause crash if the "_time"
column is no longer valid. However it will NOT track movement of
the time column once the run has started.

Hence if using dynamic columns with table driven entries:

• Ensure the time column ends up in the original position as at the
  start of the run whenever columns are manipulated
• Dont manipulate columns in the table unless the table is empty (no rows)

Otherwise the table driven entry may produce spurious items

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idkbase note 11