Added magic number to binlog
sql/log_event.cc
    distinquish bogus data from truncated logs
sql/log_event.h
    added magic number
    added LOG_READ_TRUNC error
sql/mysqlbinlog.cc
    fixed to handle magic number
    added O_BINARY to my_fopen
sql/mysqld.cc
    added code for replicate-rewrite-db
sql/slave.cc
    replicate-rewrite-db
    O_BINARY
    handle magic
sql/sql_class.h
    added i_string_pair class
sql/sql_repl.cc
    added magic
    better error messages
support-files/magic
    added magic for binlog

Added test case for replication of queries with error