Manual merged mysql-5.1-gca into latest mysql-5.5.

Conflicts
=========
Text conflict in mysql-test/suite/rpl/r/rpl_relayspace.result
Text conflict in mysql-test/suite/rpl/t/rpl_relayspace.test

Automerge mysql-5.1-gca into latest mysql-5.1.

              VM-WIN2003-32-A, SLES10-IA64-A 
      
The test case waits for master_pos_wait not to timeout, which
means that the deadlock between SQL and IO threads was 
succesfully and automatically dealt with.
      
However, very rarely, master_pos_wait reports a timeout. This
happens because the time set for master_pos_wait to wait was
too small (6 seconds). On slow test env this could be a 
problem.
      
We fix this by setting the timeout inline with the one used
in sync_slave_with_master (300 seconds). In addition we 
refactored the test case and refined some comments.

Issue:
While running embedded server, if client issues TEE command (\T foo/bar) and
"foo/bar" directory doesn't exist, it is suppose to give error. But it was
aborting.  This was happening because wrong error handler was being called.

Solution:
Modified calls to correct error handler. In embedded server case, there are 
two error handler (client and server) which are supposed to be called based 
on which context code is in. If it is in client context, client error handler
should be called otherwise server.

Test case:
Test case automation is not possible as current (following) code doesn't 
allow '\T' to be executed from command line (OR command read from a file):
[client/mysql.cc]
...
 static int
 com_tee(String *buffer __attribute__((unused)),
         char *line __attribute__((unused)))
 {
   char file_name[FN_REFLEN], *end, *param;

   if (status.batch) << THIS IS TRUE WHILE EXECUTING FROM COMMAND LINE.
      return 0;
 ...
So, not adding test case in GA. WIll add a test case in mysql-trunk after 
removing above code so that this could be properly tested before GA.

There are two problems:
1. There is a missing check for 'year' parameter(year can not be greater than 9999) in
   makedate function. fix: added check that year can not be greater than 9999.
2. There is a missing check for zero date in from_days() function.
   fix: added zero date check into Item_func_from_days::get_date()
   function.

- Added an alterantive search path for WiX components
- Added a custom welcome dialog to include the copyright line (Bug#59805 and Bug#59512)
- Excluded some binaries to make package smaller, in effect makig the
  "essentials" package obsolete
- Added a bit more error checking when running the WiX tools

WiX XML changes done by Johannes Taxacher

notifying PB2 the test fails through mysql-test/collections/default.experimental.

FREED IN FLUSH_READ_LOCK (VALGRIND WARNING).

The problem was that under some circustances the memory allocated
for Query_tables_list::sroutines was not freed properly.
The cause of this problem was the absence of
LEX::restore_backup_query_tables_list() call in one of the branches
in mysql_table_grant() function.

      
Impementing Test Review Comment.
      
Bug test scenario:      
SELECT is not returning result set for "equal" (=) and "NULL safe equal
operator"  (<=>) on BIT data type. Extending this scenario for all data types

Before this fix, a thread instrumented for the performance schema,
that would perform file io operations, could crash inside the LF_HASH
implementation, in cases when my_thread_init is not called.

The crash itself has not been reported in 5.5 but similar crashes have
been found in 5.6-based development branches, using LF_HASH for
more instrumentation.

The possibility of a crash in 5.5 is confirmed by code analysis.

The problem is that, when my_thread_init() is not called,
which can happen for threads in storage engines or thirs party code,
my_thread_var is NULL.

Using my_thread_var->stacks_ends_here in mysys/lf_alloc-pin.c is unsafe.

Given that my_thread_var is used:
- only for stacks_ends_here
- only on platform with HAVE_ALLOCA
- only when there is enough room on the stack
and given that the LF_HASH implementation has a fallback
algorythm implemented already when using alloca is not possible,
using my_thread_var->stacks_ends_here is in fact not a strict requirement,
and can be relaxed.

The fix is to:
- test explicitly if my_thread_var is NULL, to account for cases
  when my_thread_init() is not used by the calling thread.
- not use alloca in this case, and rely on the fall back code already in place.
  so that the LF_HASH can be supported even without my_thread_init().

The implementation of mysys/lf_alloc-pin.c has been fixed to support this new usage.
The units tests in unittest/mysys/lf-t.c have been adjusted accordingly.

This patch inserts an 'ENABLE_GCOV' option for enabling gcov compilation
on Linux machines. It modifies the CMakeLists.txt setting this option
to 'OFF' by default.

Note: The option requires a debug build. For example, 
      -DCMAKE_BUILD_TYPE:string="Debug" 

This assert could be triggered during two phase commit if binary
log was used as transaction coordinator log. The triggered assert
checks that the same number of transaction IDs are processed in
the prepare and commit phases.

The reason it was triggered, was that the transaction consisted
of an INSERT/UPDATE IGNORE that had an ignorable error. Since it
had an error, no row log events were made and therefore
prepared_xids was 0. However, since it was an IGNORE statement,
the statement started a read/write statement transaction, committed
it and completed successfully.

This patch fixes the problem by adjusting the assert to take
this possibility into account.

Test case added to binlog.binlog_innodb_row.test.

If LOAD DATA INFILE featured a SET clause, the name=value pairs
would be regenerated using item::print. Unfortunately, that code
is mostly optimized for EXPLAIN EXTENDED output and such, and can
not be relied on to return valid SQL.

We now name each value its original, user-supplied form and use
that to create LOAD DATA INFILE statements for statement-based
replication.