Fixed bug when using maria_chk --safe-recover and getting duplicated keys
Fixed bug when using maria_pack --join


storage/maria/ma_check.c:
  Fixed bug when using --safe-recover with packed tables
  Fixed bug when using --safe-recover and getting duplicated keys
storage/maria/maria_pack.c:
  Fixed bug when using --join
storage/maria/unittest/ma_test_all-t:
  Added test to check maria_pack --join