sql/mysql_priv.h:
  Added 'const' to some arguments
sql/sp_head.cc:
  Added comments
  code cleanup
  acceess -> access
sql/sql_acl.cc:
  Simply code by making check_routine_level_acl() available also in embedded server
sql/sql_acl.h:
  Added 'const' to some arguments
sql/sql_parse.cc:
  Added 'const' to some arguments
  Fixed the check_rounte_level_acl() is always called
  (old code didn't properly check access privilges if grant_option was not set)
sql/sql_show.cc:
  Simplify usage of get_field()
  Now we can always call check_some_routine_access()
sql/sql_udf.cc:
  Don't give warnings for suspicios UDF's if --log-warnings isn't given
sql/table.cc:
  Simplify usage of get_field()