"Process NATURAL and USING joins according to SQL:2003".

* Some of the main problems fixed by the patch:
  - in "select *" queries the * expanded correctly according to
    ANSI for arbitrary natural/using joins
  - natural/using joins are correctly transformed into JOIN ... ON
    for any number/nesting of the joins.
  - column references are correctly resolved against natural joins
    of any nesting and combined with arbitrary other joins.

* This patch also contains a fix for name resolution of items
  inside the ON condition of JOIN ... ON - in this case items must
  be resolved only against the JOIN operands. To support such
  'local' name resolution, the patch introduces a stack of
  name resolution contexts used at parse time.

NOTICE:
- This patch is not complete in the sense that
  - there are 2 test cases that still do not pass -
    one in join.test, one in select.test. Both are marked
    with a comment "TODO: WL#2486".
  - it does not include a new test specific for the task

into mysql.com:/space/my/mysql-5.0-build

  required commands/packages so the installation succeeds. Removed the superflouus
  Requires field from the source RPM.

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into  mysql.com:/home/jimw/my/mysql-4.1-clean

into  mysql.com:/home/jimw/my/mysql-4.1-clean

into  mysql.com:/home/jimw/my/mysql-4.1-clean

into  mysql.com:/home/jimw/my/mysql-5.0-clean

conflict in a unique key. (Bug #12226)

cleanup.

into  asksasha.com:/reiser-data/mysql-dev/mysql-4.1

into  mysql.com:/usr/local/home/marty/MySQL/mysql-5.0

into  mysql.com:/usr/local/home/marty/MySQL/mysql-5.0

into  alpha.xl.local:/home/schwenke/Work/MySQL/BK-internal-tree/mysql-5.0

Review of new pushed code

into  mishka.local:/home/my/mysql-5.0

into  alpha.xl.local:/home/schwenke/Work/MySQL/BK-internal-tree/mysql-5.0

into rurik.mysql.com:/home/igor/dev/mysql-4.1-0

into rurik.mysql.com:/home/igor/dev/mysql-5.0-0

  Modified test case for bug #12144.

into  mishka.local:/home/my/mysql-5.0

Change bool in C code to my_bool
Added to mysqltest --enable_parsning and --disable_parsing to avoid to have to comment parts of tests
Added comparison of LEX_STRING's and use this to compare file types for view and trigger files.

into rurik.mysql.com:/home/igor/mysql-4.1

If GROUP_CONCAT is calculated we always put its argument into a temp
table, even when the argument is a constant item.

into rurik.mysql.com:/home/igor/dev/mysql-5.0-0

into  sanja.is.com.ua:/home/bell/mysql/bk/work-trigger-5.0

to connect

into lmy002.wdf.sap.corp:/home/georg/work/mysql/prod/mysql-5.0

into  sanja.is.com.ua:/home/bell/mysql/bk/work-trigger-5.0

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into lmy002.wdf.sap.corp:/home/georg/work/mysql/prod/mysql-5.0

macro floatget was missing in config-win.h

  (thanks to JoergB for spotting it)