WL#1034
- This changeset also changes the executor so its quite more stable now.
  Stressing test case added that executes ~800 events per second and dropping
  hundreds of events at once using DROP DATABASE.
(with fixes after review of JimW)
(with fixes after review of Serg)

into lmy004.:/work/mysql-5.1-bug16410

into lmy004.:/work/mysql-5.1-bug16410

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

into lmy004.:/work/mysql-5.1-bug17289

into lmy004.:/work/mysql-5.1-bug16410

WL#1034 (Internal CRON)
(post-post-review updates)

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

into  zim.tangent.org:/home/brian/mysql/archive-5.1

into lmy004.:/work/mysql-5.1-bug17289

 - Change 94 to 95 according to Pem's instructions in bug report.

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

into  mysql.com:/usr/local/home/marty/MySQL/mysql-5.1-work

  In presense of subpartitioning use get_part_partition_id() to calculate part_id

into  mysql.com:/usr/local/home/marty/MySQL/mysql-5.1-work

  use part_info->no_subparts to calculate partition range in case of subpartitions

This patch adds a new field to the meta file for tracking flushes (this is being kept to later do stats and determine how often the compression buffer is being foiled). This should keep things all nice an compatible between versions.
Also added a flush table test as well. Found one possible bug in OPTIMIZE TABLE which has never been reported, but I think it would be possible on a file system that ran out of disk.

into  mysql.com:/home/elkin/MySQL/MERGE/5.1-new

into  zim.tangent.org:/home/brian/mysql/cleanup-5.1

into  mysql.com:/home/elkin/MySQL/MERGE/5.1-new

into lmy004.:/work/mysql-5.1-bug17289

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

1. dbug state is now local to a thread
2. new macros: DBUG_EXPLAIN, DBUG_EXPLAIN_INITIAL,
   DBUG_SET, DBUG_SET_INITIAL, DBUG_EVALUATE, DBUG_EVALUATE_IF
3. macros are do{}while(0) wrapped
4. incremental modifications to the dbug state (e.g. "+d,info:-t")
5. dbug code cleanup, style fixes
6. _db_on_ and DEBUGGER_ON/OFF removed
7. rest of MySQL code fixed because of 3 (missing ;) and 6
8. dbug manual updated
9. server variable @@debug (global and local) to control dbug from SQL!
a. -#T to print timestamps in the log

visible event in libmysqld. fixes build problem.

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/Merge/5.1-new