Fixed new bug when running a SP without a default database

database after failing to execute a stored procedure in an inaccessible
database. (Bug #12318)

The problem was that on Windows the access method indicates that access to file 
such as "com1" and "lpt1" is allowed (since they are device names) and
this causes mysql to attempt to open them as databases or tables.

The fix was to write our own my_access method that uses other Win32 functions
to determine if the given argument is indeed a file and has to requested
mode.

 - Send error to client when mysql_change_db fails.

Windows to call CreateFileMapping() with correct arguments, and
propogating the introduction of query_id_t to everywhere query ids are
passed around. (Bug #8826)

(Found during build process)

Portability fixes and cleanups
Fixed setting of 'res' in mysql_execute_command()

Split TABLE to TABLE and TABLE_SHARE (TABLE_SHARE is still allocated as part of table, will be fixed soon)
Created Field::make_field() and made Field_num::make_field() to call this
Added 'TABLE_SHARE->db' that points to database name; Changed all usage of table_cache_key as database name to use this instead
Changed field->table_name to point to pointer to alias. This allows us to change alias for a table by just updating one pointer.
Renamed TABLE_SHARE->real_name to table_name
Renamed TABLE->table_name to alias
Renamed TABLE_LIST->real_name to table_name

mysqldump skips information_schema db
'use' now can use information_schema db
changed value of column 'Null' to 'NO' if column is not nullable

Simple, non critical, fix to mysql_fix_privilege_tables

tables requires privileges for them if some table or column level grants
present" (with after-review fixes).

We should set SELECT_ACL for implicitly opened tables in 
my_tz_check_n_skip_implicit_tables() to be able to bypass privilege
checking in check_grant(). Also we should exclude those tables from
privilege checking in multi-update.

  CREATE DATABASE statement used the current database instead of the
  database created when checking conditions for replication.
  CREATE/DROP/ALTER DATABASE statements are now replicated based on
  the manipulated database.

used only one implementation of format parser of (printf)
fixed multistatement

  DROP DATABASE failed because of file ext not in TYPELIB of known extensions.
  General solution - construct a TYPELIB at runtime instead of a static list.

Now thd->mem_root is a pointer to thd->main_mem_root and THR_MALLOC is a pointer to thd->mem_root.
This gives us the following benefits:
- Allow us to easily detect if arena has already been swapped before (this fixes a bug in setup_conds() where arena was swaped twice in some cases)
- Faster swaps of arenas (as we don't have to copy the whole MEM_ROOT)
- We don't anymore have to call my_pthread_setspecific_ptr(THR_MALLOC,...) to change where memory is alloced. Now it's enough to set thd->mem_root

net_printf/send_error calls replaced by my_error family functions
-1/1 (sent/unsent) error reporting removed
(WL#2133)

This does not fix any known bug, but is still a good idea.

in a deadlock-free manner. This splits locking the global read lock in two steps.
This fixes a consequence of this bug, known as:
BUG#4953 'mysqldump --master-data may report incorrect binlog position if using InnoDB'
And a test.

  mysqld crashes on CREATE TABLE in a database with corrupted db.opt file.
  Bug#4646

two TABLE_LIST copy eliminated

as after effect of fix for Bug #4378 
'"create database IF NOT EXISTS thing" returns an error' 

(avoided an unpack_dirname and 
 changed strcat into strmake)

Some bug fixes to last pushed code

New handler::index_flags() definition to make it easy to check the full used key and a specific key part.
Added key part to optimize_range() to fix problems when using fields in key parts.

also known as
BUG#2326 Charset of table is determined by charset of db only if "USE db;"

binlog even if they changed nothing, and a test for this.
This is useful when users use these commands to clean up their master and slave by issuing
one command on master (assume master and slave have slightly different data for some
reason and you want to clean up both).
Note that I have not changed multi-table DELETE and multi-table UPDATE because their
error-reporting mechanism is more complicated.