Open and seek to end of data_file after rename 
Fix comment for when file does not need repair.
Set share->mapped_file to NULL always when it's been unmapped 
Add test to see that file can be used after repair


mysql-test/r/csv.result:
  Add more test to see that the table can be used after repair
mysql-test/t/csv.test:
  Add more test to see that the table can be used after repair
storage/csv/ha_tina.cc:
  Close share->data_file in before renaming in ha_tina::repair
  Open and seek to end after rename
  Fix comment for when file does not need repair.
  Set share->mapped_file to NULL always when it's been unmapped