Docs/manual.texi:
  updates from Matthias Urlichs
mysql-test/r/rpl000016.result:
  position sanity check - hope to catch the timing bug
mysql-test/t/rpl000016.test:
  position sanity check - hope to catch timing bug
sql/log_event.cc:
  limit event length by max_allowed_packet
sql/log_event.h:
  abolish MAX_EVENT_LEN
sql/sql_repl.cc:
  error for events larger than max_allowed_packet