Remove vtkPTableToStructuredGrid to use vtkTableToStructuredGrid instead

Change-Id: Ie2401485b43536a395dbc2c77145522aefbbc377
Add comment with more explaination

Change-Id: I7bea339670b7e61576e23c9fc3417ceae9399435
Merge topic 'table2structured_one_piece_extent_fix' into next

908d37b Add comment with more explaination
1281c9f Remove vtkPTableToStructuredGrid to use vtkTableToStructuredGrid instead