VFK: recreate DB automatically when it's outdated
|Reported by:||martinl||Owned by:||warmerdam|
The structure of underlaying DB changed across GDAL versions (mainly
vfk_tables table). The patch bellow checks if
vfk_tables has certain number of columns, if the condition is not satisfied than the DB is deleted and created from scratch. Currently the VFK driver fails with invalid SQL command.