1. Made sure that base64 string is terminated with NUL.
2. Made calculation of needed size for base64 string exact.
Added checks in test for the above two fixes.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into mysql.com:/home/psergey/mysql-5.0-oct25-test

into mysql.com:/home/psergey/mysql-5.0-oct25-test

into moonbone.local:/work/14138-bug-5.0-mysql

  After merge fix

into  frost.snake.net:/Users/paul/bk/mysql-5.0

into mysql.com:/home/psergey/mysql-5.0-oct25-test

into mysql.com:/home/psergey/mysql-4.1-bug14139

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

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

into  mysql.com:/home/alexi/dev/mysql-4.1-10511

 ON UPDATE CASCADE

into  mysql.com:/usr/home/pem/bug14256/mysql-5.0

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into  sanja.is.com.ua:/home/bell/mysql/bk/work-owner7-5.0

Procedure analyse() redefines select's fields_list. setup_copy_fields() assumes
that fields_list is a part of all_fields_list. Because select have only 
3 columns and analyse() redefines it to have 10 columns, int overrun in
setup_copy_fields() occurs and server goes to almost infinite loop.

Because fields_list used not only to send data ad fields types, it's wrong 
to allow procedure redefine it. This patch separates select's fileds_list 
and procedure's one. Now if procedure is present, copy of fields_list is 
created in procedure_fields_list and it is used for sending data and fields.

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

kernel function to prevent CPU hogs.

into  mysql.com:/home/cps/mysql/trees/mysql-5.0-virgin

  Changed the parser test for wildcards in hostname to checking for empty
  strings instead (analogous with the test in default_view_definer()),
  since wildcards do appear in the definer's host-part sometimes.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

 - Use msg argument to determine if param is required or not in safe_get_param

into  sanja.is.com.ua:/home/bell/mysql/bk/work-owner7-5.0

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

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0-tmp