Fix the IndexStatistics to use Row/RowType.
The great purge part 1: Remove the RowData/RowDef paths in Store,
OnlineHelper, ConstraintHandler, and their sub-classes. Compiles, but
not tested.
The great purge part 2: remove the RowData paths from the
StoreStorageDescription and it's implementations. Compiles but not
tested.
Remove the RowData API from the StoreData interface, mostly gone, but
now clean.
The great purge part 3: The final details. Remove more corners and
unused methods from various classes. One last peice to go.
Update the KeyUpdate tests to use Row/Row types for their processing.
Get rid of the rowData processing.
Move the TableStatus to table. Update the various calls to
rowData().getTableStatus() to directly call the Table.tableStatus()

Update the RowDefBuilder to also set the correct TableStatus to the
table.
Remove more uses of RowData and RowDef from the various part of the
code. 

- A call in DDLFunctions to get RowDef, now no longer used
- SpatialColumnsHandler to remove the RowData interface