+Using the first form of this function, if the column definition is not able
+to be created, a value of false is returned. If the specified index of the
+column exceeds the number of columns defined in the wxDbTable instance, an
+assert is thrown and logged (in debug builds) and a false is returned.
+
+A failure to create the column definition in the second form results in a
+value of NULL being returned.
+