2) We now store shortest and longest row information.
3) archive_reader can now check and backup files (even if they are hot)
4) We now record longest and shortest row information for stats. 


storage/archive/archive_reader.c:
  Added options for:
  1) Online backup for tables
  2) Check table option.
storage/archive/archive_test.c:
  Additional test, format is now the same as an actual table.
storage/archive/azio.c:
  Fixed issue closing files multiple times.
  Added option for recording longest and shortest rows. 
  Additional "dirty" state added.
storage/archive/azlib.h:
  Added additional space for longest and shortest row information.
storage/archive/ha_archive.cc:
  Cleaned up warming and removed unneeded close.