The build scripts in general, using automake, autoconf, etc, contain several
special commands and work around all related to the way the bison code in the
parser is built, for sql/sql_yacc.yy. These work arounds, accumulated over
time during development, ultimately cause the build scripts to be unstable
and cause build defects by not enforcing dependencies.

This fix simplifies the build process and aligns it with the automake tooling,
which provides native support for bison and *.yy files.

In particular, the following problem have been fixed:
- dependencies with sql_yacc.cc were not honored (Bug 21029), leading to
  corrupted builds,
- the work around introduced by Bug 24557, to cleanup the generated files
  sql_yacc.h and sql_yacc.cc, has been removed,
- the generated makefile, in a source distribution, used to destroy the files
  sql_yacc.h and sql_yacc.cc on a 'make clean' target. This has been fixed:
  these files are now removed by make maintainer-clean.
- The root cause of the problem found with gcc 4.1 (see Bug 24619) has been
  clearly documented, and the "sed" hack has been replaced by a cleaner
  work around, when building the code with bison 1.875.
- Removed the file sql/sql_yacc.yy.bak, added by WL 3031 by accident.
- Removed the unnecessary AM_YFLAG= --debug introduced by WL 3432, since
  the compiling option DBUG_OFF takes precedence when setting YYDEBUG.

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-25183

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-25302

into  moonlight.home:/home/tomash/src/mysql_ab/mysql-5.1-bug23443

into  moonlight.home:/home/tomash/src/mysql_ab/mysql-5.0-bug23443

into  moonlight.home:/home/tomash/src/mysql_ab/mysql-4.1-bug23443

           server

The problem was that when memory was exhausted HEAP engine could crash
(GROUP BY uses HEAP TABLE).  Alternatively, if SET was used, it could
report an error "You may only use constant expressions with SET" instead
of "Out of memory (Needed NNNNNN bytes)".

The solution is:
 - pass MY_WME to (some) calls to my_malloc() to get correct message.
 - fix heap_write() so that the first key is skipped during cleanup
   on ENOMEM because it wasn't inserted and doesn't have to be
   deleted.

No test case is provided because we can't test out-of-memory behaviour
in our current test framework.

This fix corrects build issues introduced by WL#3031:

- In the SQL grammar, 'USER' is a SQL 2003 reserved keyword,
and therefore should not be part of the keyword production.

- In sql/sql_parse.cc, the code for CREATE SERVER and ALTER SERVER
was not using proper format strings in the DBUG_PRINT statements.

Merge 5.1-main -> 5.1-runtime, added ignore entry for missing symbolic link

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-merge

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

    Delete compiler-specific flag setting - it makes builds break.

into  mysql.com:/home/kent/bk/main/mysql-5.1

  Temporary work around for bug#25359

  Removed "MySQL Finland AB & TCX DataKonsult AB" from copyright header
  Adjusted year(s) in copyright header 
  Added GPL copyright text
my_vle.h, rpl_utility.h, my_vle.c, base64-t.c, rpl_utility.cc:
  Changed copyright header formatting some
plugin_example.c, daemon_example.c:
  Added "Copyright (C) 2006 MySQL AB" to GPL header

into  mysql.com:/home/kent/bk/main/mysql-5.1

into  mysql.com:/home/kent/bk/main/mysql-5.1

into  mysql.com:/home/kent/bk/main/mysql-5.0

  Corrected spelling in copyright text
Makefile.am:
  Don't update the files from BitKeeper
Many files:
  Removed "MySQL Finland AB & TCX DataKonsult AB" from copyright header
  Adjusted year(s) in copyright header 
Many files:
  Added GPL copyright text
Removed files:
  Docs/Support/colspec-fix.pl
  Docs/Support/docbook-fixup.pl
  Docs/Support/docbook-prefix.pl
  Docs/Support/docbook-split
  Docs/Support/make-docbook
  Docs/Support/make-makefile
  Docs/Support/test-make-manual
  Docs/Support/test-make-manual-de
  Docs/Support/xwf

into  willster.(none):/home/stewart/Documents/MySQL/5.0/ndb-mgm-work

into  poseidon.mysql.com:/home/tomas/mysql-5.0-ndb

into  poseidon.:/home/tomas/mysql-5.1-new-ndb

into  mysql.com:/home/kent/bk/main/mysql-5.1

  Changed header to GPL version 2 only

into  xiphis.org:/home/antony/work2/mysql-5.0-engines-merge

into  xiphis.org:/home/antony/work2/mysql-5.1-engines-merge

into  mysql.com:/home/svoj/devel/mysql/BUG25048/mysql-5.1-engines

            repair it

Multi-table delete that is optimized with QUICK_RANGE reports table
corruption.

DELETE statement must not use KEYREAD optimization, and sets
table->no_keyread to 1. This was ignored in QUICK_RANGE optimization.

With this fix QUICK_RANGE optimization honors table->no_keyread
value and does not enable KEYREAD when it is requested.

into  mysql.com:/home/kent/bk/main/mysql-5.1

  Changed header to GPL version 2 only

into  mysql.com:/home/kent/bk/main/mysql-5.1

into  radha.patg.net:/Users/patg/mysql-build/mysql-5.1-arch-merge

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

into  radha.patg.net:/Users/patg/mysql-build/mysql-5.1-arch-merge

before referencing it.

into  pilot.mysql.com:/home/msvensson/mysql/mysql-5.1-new-ndb