WL#3071 Maria checkpoint, WL#3072 Maria recovery

instead of fprintf(stderr) when a task (with no user connected) gets
an error, use my_printf_error(). Flags ME_JUST_WARNING and ME_JUST_INFO
added to my_error()/my_printf_error(), which pass it to
my_message_sql() which is modified to call the appropriate
sql_print_*(). This way recovery can signal its start and end with
[Note] and not [ERROR] (but failure with [ERROR]).
Recovery's detailed progress (percents etc) still uses stderr as they
have to stay on one single line.
sql_print_error() changed to use my_progname_short (nicer display).
mysql-test-run.pl --gdb/--ddd does not run mysqld, because
a breakpoint in mysql_parse is too late to debug startup problems;
instead, dev should set the breakpoints it wants and then "run" ("r").


include/my_sys.h:
  new flags to tell error_handler_hook that this is not an error
  but an information or warning
mysql-test/mysql-test-run.pl:
  when running with --gdb/--ddd to debug mysqld, breaking at mysql_parse
  is too late to debug startup problems; now, it does not run mysqld,
  does not set breakpoints, developer can set as early breakpoints
  as it wants and is responsible for typing "run" (or "r")
mysys/my_init.c:
  set my_progname_short
mysys/my_static.c:
  my_progname_short added
sql/mysqld.cc:
  * my_message_sql() can now receive info or warning, not only error;
  this allows mysys to tell the user (or the error log if no user)
  about an info or warning. Used from Maria.
  * plugins (or engines like Maria) may want to call my_error(), so
  set up the error handler hook (my_message_sql) before initializing
  plugins; otherwise they get my_message_no_curses which is less
  integrated into mysqld (is just fputs())
  * using my_progname_short instead of my_progname, in my_message_sql()
  (less space on screen)
storage/maria/ma_checkpoint.c:
  fprintf(stderr) -> ma_message_no_user()
storage/maria/ma_checkpoint.h:
  function for any Maria task, not connected to a user (example:
  checkpoint, recovery; soon could be deleted records purger)
  to report a message (calls my_printf_error() which, when inside ha_maria,
  leads to sql_print_*(), and when outside, leads to
  my_message_no_curses i.e. stderr).
storage/maria/ma_recovery.c:
  To tell that recovery starts and ends we use ma_message_no_user()
  (sql_print_*() in practice). Detailed progress info still uses
  stderr as sql_print() cannot put several messages on one line.
  071116 18:42:16 [Note] mysqld: Maria engine: starting recovery
  recovered pages: 0% 67% 100% (0.0 seconds); transactions to roll back: 1 0 (0.0
  seconds); tables to flush: 1 0 (0.0 seconds);
  071116 18:42:16 [Note] mysqld: Maria engine: recovery done
storage/maria/maria_chk.c:
  my_progname_short moved to mysys
storage/maria/maria_read_log.c:
  my_progname_short moved to mysys
storage/myisam/myisamchk.c:
  my_progname_short moved to mysys

mysys/my_init.c

@@ -78,6 +78,7 @@ my_bool my_init(void)
   my_umask= 0660;                       /* Default umask for new files */
   my_umask_dir= 0700;                   /* Default umask for new directories */
   init_glob_errs();
+  my_progname_short= my_progname + dirname_length(my_progname);
 #if defined(THREAD) && defined(SAFE_MUTEX)
   safe_mutex_global_init();		/* Must be called early */
 #endif