when there are no up-to-date system tables to support it:
 - initialize the scheduler before reporting "Ready for connections".
   This ensures that warnings, if any, are printed before "Ready for
   connections", and this message is not mangled.
 - do not abort the scheduler if there are no system tables
 - check the tables once at start up, remember the status and disable
   the scheduler if the tables are not up to date.
   If one attempts to use the scheduler with bad tables,
   issue an error message.
 - clean up the behaviour of the module under LOCK TABLES and pre-locking
   mode
 - make sure implicit commit of Events DDL works as expected.
 - add more tests


Collateral clean ups in the events code.

This patch fixes Bug#23631 Events: SHOW VARIABLES doesn't work 
when mysql.event is damaged

into  bodhi.local:/opt/local/work/mysql-5.1-c1

the lexer API which internally uses  unsigned char variables to
address its state map. The implementation of the lexer should be
internal to the lexer, and not influence the rest of the code.

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.1-runtime

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.1-runtime

- 1.84e+15 converted to unsigned bigint should be
  18400000000000000000 < 18446744073709551615.
- The test will still fail on windows, and is extracted
  into a new bug report.

into  naruto.:C:/cpp/mysql-5.0-runtime

into  naruto.:C:/cpp/mysql-5.1-runtime

into  naruto.:C:/cpp/mysql-5.1-runtime

to not collide with the recently introduced thread scheduler module.

A larger patch is to come, this is to exclude rudimentary changes
from it.

into  bodhi.local:/opt/local/work/mysql-5.1-runtime

into  bodhi.local:/opt/local/work/mysql-5.1-runtime

into  bodhi.local:/opt/local/work/mysql-5.0-runtime

into  naruto.:C:/cpp/mysql-5.1-runtime

into  bk-internal.mysql.com:/data0/bk/mysql-5.1-opt

  After merge fix.

into  moonbone.local:/mnt/gentoo64/work/test-5.1-opt-mysql

  Removed wrong fix for the bug#27006.
  The bug was added by the fix for the bug#19978 and fixed by Monty on 2007/02/21.
trigger.test, trigger.result:
  Corrected test case for the bug#27006.

into  bodhi.local:/opt/local/work/mysql-5.1-runtime

into  bodhi.local:/opt/local/work/mysql-5.1-runtime

into  bodhi.local:/opt/local/work/mysql-5.0-runtime

include/config-win.h: SIZEOF_INT
include/my_global.h: win64 fix
support-files/Makefile.am: automake magic

into  janus.mylan:/usr/home/serg/Abk/mysql-5.1

s/ulonglong/key_part_map/, comments

  Post-merge fix.

into  janus.mylan:/usr/home/serg/Abk/mysql-5.1

into  moonbone.local:/mnt/gentoo64/work/test-5.1-opt-mysql