Bug 5912: TableSlot column units not handled correctly adding/deleting columns
Bug Number: 5912 and 5858
Release notes (y/n): Yes (7.0.6)
For Release Nums: 7.0.6 and 7.1

Gnats 5912: Inserting columns in table slots with different units messes up 
  the units on the existing columns.

Gnats 5858: Periodic Slot: Delete column doesn't adjust numeric column 
  headers.

SEE WEBPAGE with screenshots -- problems and fixes:
http://cadswes2.colorado.edu/~philw/pub/5912/5912.html

Actually, three problems related to changing the number of columns in 
TableSlots were found and fixed:

  (1) Column Insertion in TableSlot (as described in the bug report) 
      -- Column Units Problem.

  (2) Column Deletion in TableSlot -- Column Units Problem.

  (3) Column Deletion in TableSlot with Column Map (e.g. Periodic Slot) 
      -- Column Value Problem.

Technical Notes:

  (1) TableSlot::insertColumn (int) wasn't adjusting column units starting 
      at the new column.

  (2) Deleting a column from a table slot also wasn't adjusting column units.
      See changes in TableSlot::deleteColumn (int).

  (3) Deleting a column from a TableSlot (e.g. a Periodic Slot) having a 
      "column map" (NumericDimension) had been just truncating the column 
      map instead of removing the deleted column's item from the column map.
      See changes in TableSlot::deleteColumn (int) and deleteLastColumn().

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