This patch adds a new field to the meta file for tracking flushes (this is being kept to later do stats and determine how often the compression buffer is being foiled). This should keep things all nice an compatible between versions.
Also added a flush table test as well. Found one possible bug in OPTIMIZE TABLE which has never been reported, but I think it would be possible on a file system that ran out of disk.


mysql-test/r/archive.result:
  New results
mysql-test/t/archive.test:
  Added test for flush tables, which will also let me confirm DELAYED INSERT.
sql/ha_archive.cc:
  Adding new stat
sql/ha_archive.h:
  Just extending SHARE