mysqlbinlog now prints "# Number of rows" and stops on errors

Main problem was that no log-event print function checked for disk
full error on the IO_CACHE.
All changes in this patch only affects mysqlbinlog, not the server!

- Changed all log-event print functions to return 1 on error
- Fixed memory usage when not using --flashback.
- Added printing of number of rows in row events. Can be disabled with
  --print-row-count=0
- Print annotated rows when using mysqlbinlog --short-form
- Fixed that mysqlbinlog --debug works
- Fixed create_drop_binlog.test test failure
- Reorganized fields in PRINT_EVENT_INFO to be according to size to
  optimize storage
- Don't change print_row_event_position or print_row_counts if set by user
- Remove some testing of argument to my_free is 0
- base64-output=never is now supported and works in all context
- Updated help information for --base64-output and --short-form
- print_row_count is now on by default. Reset automatically if --short-form
  is used
- Removed obsolote warning for mysql 5.6.0
- More DBUG_PRINT for mysqltest.cc
- my_b_write_byte() now checks for flush failures. This fixed a memory
  overrun on disk full
- my_b_printf() now returns 1 on failure, 0 on ok.  This simplifies code
  and no old code was using the old return value of my_b_printf().
- my_b_Write_backtick_quote() now returns 1 on failure and 0 on ok
- Fixed some error conditions in log printing that was not previously
  handled.
- Slave_rows_error_report() can now handle longlong positions
- Write_on_release_cache() rewritten so that we can detect errors
  on flush. Not depending on automatic release anymore.
- Changed types for Pos and End_log_pos to 64 bit in SHOW BINLOG EVENTS
- Fixed that copy_event_cache_to_string_and_reinit() works with strings
  longer than 4G (Changed to use LEX_STRING instead of String)
- Restricted binlog_rows_event_max_size to UINT32_MAX-1 as String's are
  anyway restricted to UINT32_MAX
- Fixed bug in rpl_binlog_state::write_to_iocache() which hide write
  failures (duplicate variable name)
- Fixed bug in String::append if original string was not allocated
- Stop mysqlbinlog output at once if there is an error.
- Before printing error message, flush result file. This ensures that
  the error message is printed last. (Easier to find)

mysql-test/r/mysqlbinlog.result

@@ -879,9 +879,7 @@ ROLLBACK /* added by mysqlbinlog */;
 End of 5.0 tests
 End of 5.1 tests
 # Expect deprecation warning.
-WARNING: The --base64-output=always flag and the --base64-output flag (with '=MODE' omitted), are deprecated. The output generated when these flags are used cannot be parsed by mysql 5.6.0 and later. The flags will be removed in a future version. Please use --base64-output=auto instead.
 # Expect deprecation warning again.
-WARNING: The --base64-output=always flag and the --base64-output flag (with '=MODE' omitted), are deprecated. The output generated when these flags are used cannot be parsed by mysql 5.6.0 and later. The flags will be removed in a future version. Please use --base64-output=auto instead.
 RESET MASTER;
 CREATE DATABASE test1;
 USE test1;