Problem: the data file changes made during delete/update are not visible to 
other threads as the file is reopened, so reading data 
with old descriptors might miss the changes.

Fix: reopen the data file before reading if it was reopened during 
delete/update to ensure there's no data behind.

Note: there's no simple test case.


storage/csv/ha_tina.cc:
  Fix for bug #29253: csv table reportedly marked as crashed
    - use the data file version technic to ensure we always see changes
      made by other threads:
        a) increase share->data_file_version each time we reopen the data 
           file, i.e. at the end of update/delete.
        b) compare the local data file version with the shared one each time 
           we want to read data, reopen it if they differ.
storage/csv/ha_tina.h:
  Fix for bug #29253: csv table reportedly marked as crashed
    - use the data file version technic to ensure we always see changes
      made by other threads:
        a) increase share->data_file_version each time we reopen the data 
           file, i.e. at the end og update/delete.
        b) compare the local data file version with shared one each time 
           we want to read data, reopen it if they differ.