- Don't delete pages without flushing that has had a tail or head information in pagecache_delete()
  This fixes a case where REPAIR could find old deleted rows.


storage/maria/ha_maria.cc:
  Remove calls to depricated function ha_statistic_increment
storage/maria/ma_blockrec.c:
  Don't delete pages without flushing that has had a tail or head information in pagecache_delete()
storage/maria/ma_pagecache.c:
  Added possibility to mark pages to not be deleted by pagecache_delete() without beeing flushed.
storage/maria/ma_pagecache.h:
  Added new prototype