kes Another try at fixing Vbackup. It looks much better this time.

     Disable file index sanity check in FD with value stored in
     attributes record because with Vbackup the File Index gets
     changed, but not the attributes record.
     Enhance some debug code.
     Fix handling of re-indexing records that are copied in Vbackup.
29Aug08
kes  Made level_to_str() know about Virtual backup.
kes  Set correct Virtual backup write pool.