handling of savepoints in stored routines.

Fixed ha_rollback_to_savepoint()/ha_savepoint()/ha_release_savepoint()
functions to properly handle savepoints inside of stored functions and
triggers.
Also now when we invoke stored function or trigger we create new savepoint
level. We destroy it at the end of function/trigger execution and return back
to old savepoint level.

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

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

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

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  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

  Added "base64.h" to enable "make dist" to work

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

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

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

Cleaned up xxxx_gis.test's and made gis_generic.inc independent of ndb
(Note that archive_gis.test fails, but this is independent of this patch)

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

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

into moonbone.local:/work/13855-bug-4.1-mysql

  After merge fix

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

into  selena.:H:/MYSQL/src/#13377-mysql-5.0a

Code that closes current relay log is moved to purge_relay_logs().

  Dump MY_CS_CSSORT when it's necessary.

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

Added back missing return in mysql_delete()

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

  Updating to conform the current CHARSET_INFO structure.

into  mysql.com:/usr/home/bar/mysql-4.1.b13347

into  mysql.com:/usr/home/ram/work/5.0.b14290

into  mysql.com:/space/pekka/ndb/version/my50

into  mysql.com:/home/mydev/mysql-5.0-bug12166