Avoid compiler warnings

into  sergbook.mysql.com:/usr/home/serg/Abk/mysql-5.1-wl2936

  VC++ does not like compile_time_assert() macro

into  sergbook.mysql.com:/usr/home/serg/Abk/mysql-5.1-wl2936

  fix compile error when DBUG_OFF

into  chilla.local:/home/mydev/mysql-5.1-wl2936-two

into  chilla.local:/home/mydev/mysql-5.1-wl2936

Changed back (type != OPT_SESSION) to (type == OPT_GLOBAL)

into  chilla.local:/home/mydev/mysql-5.1-wl2936-two

    provide the writable datadir for mysqld --help (for lower_case test)
sql/log.h, sql/mysqld.cc
    make default binlog_format value to be 0 (for a hack of using
    GET_STR for enum to continue to work)

into  chilla.local:/home/mydev/mysql-5.1-wl2936-two

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.0-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.0-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-4.1-engines

Ingo's patch:
WL#2936 - Falcon & MySQL plugin interface: server variables
Added initialization for plugin string variables with their
default values.
Added deallocation of string values before a plugin and its
variables is deleted.
Added examples to plugin_example

into  trift-lap.fambruehe:/MySQL/M51/push-5.1

into  trift-lap.fambruehe:/MySQL/M50/push-5.0

into  trift-lap.fambruehe:/MySQL/M51/push-5.1

into  trift-lap.fambruehe:/MySQL/M50/push-5.0

into  trift-lap.fambruehe:/MySQL/M41/push-4.1

into  trift-lap.fambruehe:/MySQL/M50/push-5.0

into  trift-lap.fambruehe:/MySQL/M51/push-5.1

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1-build

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1-build

```yaml
Merge pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-build-work-vanilla-building
into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1-build-work-vanilla-building
```

Fix test cases to pass for a plain ./configure && make build. This includes disabling two test cases when certain features are not present in the server. We're not losing coverage from this because these features are usually present, and disabling them here only serves the purpose to make the test cases work in the unlikely case that they aren't.
---
fixes

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/maint/51

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/maint/50

  Disable assert causing bug # 28030 temporarily, since it's non-critical, and the bug have been filed

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1-build