Fix: Custom Table Slot column deletion blowing away column labels [5891]
Bug Number: 5891
Release notes (y/n): Yes
For Release Nums: 7.0.2

Gnats 5891: Deleting a column on custom table slot on a simulation 
 object blows away column labels.

See an illustration of the problem (left side):
  http://cadswes2.colorado.edu/~philw/2017/bugs/5891/5891a.png

This was caused by an omission in the introduction of Custom Slots 
(on non-data objects).  The SimObj class hierarchy defines an 
'autoColumnRelabelingSupported' predicate, virtual method, which 
indicates that an automatic column label setting algorithm should be 
applied when the number of columns of a slot changes.  We don't want 
this to be applied for slots on Data Objects, nor on _custom_ (user 
created) slots on other simulation objects. (Nor on particular slots 
on three engineering object classes).

This 'autoColumnRelabelingSupported' predicate was introduced on 5-11-2006 
(11 years ago) to address Gnats 3950 ("When columns are deleted from a 
table slot, the column headers are renamed with 1, 2, 3,... on the end of 
the names") for RiverWare 4.8.  See the use of this predicate in method, 
TableSlot::updateAllBlockColNames().  And see git commit: 
55818c42fe6a08a9a8a7c083f8d5f8aff86aa3a2.  

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