Unit:  SDL_replist  Class:  TRLData  Declaration:  property NrOfColumns: longint; 
The property NrOfColumns specifies the number of columns of the data structure.
Hint 1: 
Increasing the number of columns preserves all information in the table, while decreasing its number of columns destroys the information contained in the removed (rightmost) columns. 
Hint 2: 
Increasing the number of columns requires considerably more computing time than decreasing it. Thus one should set
or change the number of columns not too often. 
Hint 3: 
In the Light Edition the max. number of cells of the data table is restricted to 2000 (i.e. the product of NrOfColumns times NrOfRows must not exceed 2000). 
