(SUBSTRING inside a stored function works too slow).

Background:
  - THD classes derives from Query_arena, thus inherits the 'state'
    attribute and related operations (is_stmt_prepare() & co).

  - Although these operations are available in THD, they must not
    be used. THD has its own attribute to point to the active
    Query_arena -- stmt_arena.

  - So, instead of using thd->is_stmt_prepare(),
    thd->stmt_arena->is_stmt_prepare() must be used. This was the root
    cause of Bug 60025.

This patch enforces the proper way of calling those operations.
is_stmt_prepare() & co are declared as private operations
in THD (thus, they are hidden from being called on THD instance).

The patch tries to minimize changes in 5.5.

between 5.1 and 5.5, it's purpose is to set the compiler flags in a way that
does not optimize away the call stack(i.e don't use any -OX flags at all)

Automerge from mysql-5.1 into mysql-5.5.

Automerged bzr bundle from bug report:
luis.soares@oracle.com-20110505224815-6ob90n7suxsoizvs.bundle

Manual merge from mysql-5.1 into mysql-5.5.

Conflicts
=========
Text conflict in mysql-test/suite/rpl/t/rpl_row_until.test
Text conflict in sql/handler.h
Text conflict in storage/archive/ha_archive.cc

            
Fix for all "postion" in Oracle files (s/postion/position). 
Updated the copyright notices where needed.

Automerging cset into latest mysql-5.5.

WORK WITH --START-POSITION
      
If setting --start-position to start after the FD event, mysqlbinlog
will output an error stating that it has not found an FD event.
However, its not that mysqlbinlog does not find it but rather that it
does not processes it in the regular way (i.e., it does not print it).
Given that one is using --base64-output=DECODE-ROWS then not printing
it is actually fine.
      
To fix this, we make mysqlbinlog not to complain when it has not
printed the FD event, is outputing in base64, but is decoding the
rows.

There are a couple of valgrind warnings in 5.5 codebase, that
do not exist in 5.6. The root cause was found and fixed in 5.6
codebase before (BUG#11763880 and BUG#11763879), but the patches
were only pushed to 5.6.

To fix it in 5.5, we cherrypicked the csets from 5.6 and merged 
them in 5.5.

zhenxing.he@sun.com-20101117085902-n9gfvlkmm44t38y0
  
This takes care of valgrind warnings in 5.5 that exhibit
the same trace as in BUG#11763879 (BUG#56649).

zhenxing.he@sun.com-20101202073812-iel8lvhmulyagtsv

This takes care of valgrind warnings in 5.5 that exhibit
the same trace as in BUG#11763880 (BUG#56650).

The problem was that wrong structure of mysql.event was not detected and
the server continued to use wrongly-structured data.

The fix is to check the structure of mysql.event after opening before
any use. That makes operations with events more strict -- some operations
that might work before throw errors now. That seems to be Ok.

Another side-effect of the patch is that if mysql.event is corrupted,
unrelated DROP DATABASE statements issue an SQL warning about inability
to open mysql.event table. 

Make a qualified guess: if $basedir/lib does not exist but $basedir/lib64
  does, then the latter is the proper value for $MYSQL_LIBDIR
Tested on the RPMS of 5.5.12.

Added code to look for repetitions and only repeat warnings once
Reduced time spent in check-warnings by almost 20% for full test suite

                      .editrc on linux.

MySQL client when build with libedit support ignores
.editrc at startup.

The reason for this regression was the incluison of a
safety check, issetugid(), which is not available on
some linux platforms.

Fixed by adding an equivalent check for platforms which
have get[e][u|g]id() set of functions.

(empty, the exact same changes are already in 5.5)

Add extra codes to wait_until_disconnected.inc that are present in 5.5,
but not in 5.1. The missing codes cause innodb_bug59641 to fail in 5.1 on
Windows PB2 runs. The addition of those codes in 5.5 was done in
luis.soares@sun.com-20090930233215-aup3kxy4j6ltvjfp

Removed STDCALL from the function definition.

BEFORE: First packet sent by client-side plugin (generated by Windows
function InitializeSecurityContext()) could be longer than 255 bytes 
violating the limitation imposed by authentication protocol.

AFTER: Handshake protocol is  changed so that if first client's reply is 
longer than 254 bytes then  it is be sent in 2 parts. However, for replies
shorter than 255 bytes nothing changes.

ADDITIONAL CHANGES: 
- The generic packet processing loop  (Handshake::packet_processing_loop) 
has been refactored. Communication with the peer has been abstracted
into virtual methods read/write_packet() which are implemented in client 
and server and transparently do the required splitting and gluing of packets.
- Make it possible to optionally use dbug library in the plugin.
- Add code for testing splitting of long first client reply.

into the server repository

This patch adds client windows authentication plugin code to the client 
library libmysql (only on Windows platform). The plugin is compiled into 
the library and added to the list of built-in plugins. This way clients 
should be able to connect to a server which uses windows authentication 
plugin even as an SQL user which uses such authentication.

Note: this makes the client library to depend on Secur32 Windows system
library. When building clients, they must be linked against Secur32. 
Command mysql_config --libs correctly lists Secur32 as a required 
dependency.