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)

sql/rpl_gtid.cc

@@ -1460,7 +1460,6 @@ rpl_binlog_state::write_to_iocache(IO_CACHE *dest)
   mysql_mutex_lock(&LOCK_binlog_state);
   for (i= 0; i < hash.records; ++i)
   {
-    size_t res;
     element *e= (element *)my_hash_element(&hash, i);
     if (!e->last_gtid)
     {
@@ -1480,8 +1479,8 @@ rpl_binlog_state::write_to_iocache(IO_CACHE *dest)
         gtid= e->last_gtid;
 
       longlong10_to_str(gtid->seq_no, buf, 10);
-      res= my_b_printf(dest, "%u-%u-%s\n", gtid->domain_id, gtid->server_id, buf);
-      if (res == (size_t) -1)
+      if (my_b_printf(dest, "%u-%u-%s\n", gtid->domain_id, gtid->server_id,
+                      buf))
       {
         res= 1;
         goto end;