- Fixed performance bug in alter table with Aria; Aria didn't use disable keys + enable keys
- Fixed wrong warning about 'Wrong CRC on datapage' from REPAIR TABLE with aria block tables.
- Fixed bug in aria_chk that disabled performance counters.
- Added --translog_buffer_size to maria_read_log.

storage/maria/ha_maria.cc:
  Fixed performance bug in alter table with Aria; Aria didn't use disable keys + enable keys
storage/maria/ma_bitmap.c:
  Added some DBUG_ASSERT()'s and made code more uniform
storage/maria/ma_check.c:
  Fixed wrong warning about 'Wrong CRC on datapage' from REPAIR TABLE with aria block tables.
storage/maria/ma_pagecache.c:
  Copy read pages to buffer even if there was an error (to be able to detect zero filled pages)
storage/maria/maria_chk.c:
  Fixed bug in aria_chk that disabled performance counters.
storage/maria/maria_read_log.c:
  Added option to set translog_buffer_size