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

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

Added initialization for the plugin structure created in
plugin_add().
Made a correct argument vector in mysql_install_plugin():
handle_options() assumes that arg0 (program name) always exists.

    fixed the test
sql/ha_ndbcluster.cc
    LOCK_plugin is used in ha_ndbcluster.cc
sql/sql_plugin.cc
    LOCK_plugin is used in ha_ndbcluster.cc

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

Fixed a compiler dependent expression to be more portable.
Initialized 'dummy' in construct_help_options() so that loaded
plugin show themselves as TRUE in the help output.

    set --language correctly even for --help (to have full plugin help)
mysql-test/lib/mtr_cases.pl
    more robust check for innodb

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

fixed an assert crash

    remove endspaces and tabs

into  trift2.:/MySQL/M51/push-5.1

into  trift2.:/MySQL/M50/push-5.0

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-build-work

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-work

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

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-build-work

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-build-work

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

into  mysql.com:/home/kent/bk/tmp3/mysql-4.1-build

into  mysql.com:/home/kent/bk/tmp3/mysql-5.0-build

into  mysql.com:/home/kent/bk/tmp3/mysql-5.1-build

into  mysql.com:/home/kent/bk/tmp3/mysql-5.1-build

  Back port of include change and copyright from 5.1
Makefile.am, zlib.m4:
  Use separate libtool convenience library for the bundled
  zlib to embed into executables and shared libraries created,
  and one to install into the pkglib directory

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

into  mysql.com:/d2/hf/mrg/mysql-5.1-opt

into  mysql.com:/d2/hf/mrg/mysql-5.0-opt

into  mysql.com:/d2/hf/mrg/mysql-5.1-opt

into  mysql.com:/d2/hf/mrg/mysql-5.1-opt

into  mysql.com:/d2/hf/mrg/mysql-5.0-opt

into  mysql.com:/home/kent/bk/tmp4/mysql-5.1-engines

into  mysql.com:/home/kent/bk/tmp4/mysql-5.0-engines