Documented some binlog events using doxygen. More will be done later.
Also fixed typos in other comments and added remarks about dubious code.
Only comments are affected, there is no change to the actual code.

into  kindahl-laptop.dnsalias.net:/home/bk/b24860-mysql-5.1-rpl

replication):

Incremental patch to enable idempotency support for update events again.
The final handling of errors will be done in BUG#31609, and until then
the handling of errors should be consistent between the different types
of changes.

into  kindahl-laptop.dnsalias.net:/home/bk/b28618-mysql-5.1-rpl

If a temporary error occured inside a group on an event that was not the first
event of the group, the slave could get stuck because the retry counter is reset
whenever an event was executed successfully.

This patch only reset the retry counter when an entire group has been successfully
executed, or failed with a non-transient error.

When replicating an update pair (before image, after image) under row-based
replication, and the before image is not found on the slave, the after image
was not discared, and was hence read as a before image for the next row.
Eventually, this lead to an after image being read outside the block of rows
in the event, causing an assertion to fire.

This patch fixes this by reading the after image in the event that the row
was not found on the slave, adds some extra debug assertion to catch future
errors earlier, and also adds a few non-debug checks to prevent reading
outside the block of the event.

is possible):

When skipping the beginning of a transaction starting with BEGIN, the OPTION_BEGIN
flag was not set correctly, which caused the slave to not recognize that it was
inside a group. This patch sets the OPTION_BEGIN flag for BEGIN, COMMIT, ROLLBACK,
and XID events. It also adds checks if inside a group before decreasing the
slave skip counter to zero.

Begin_query_log_event was not marked that it could not end a group, which is now
corrected.

into  kindahl-laptop.dnsalias.net:/home/bk/b29549-mysql-5.1-target-5.1.22

storage engines do not set the unused null bits (i.e., the
filler bits and the X bit) correctly. Also adding some casts
to debug printouts to eliminate compiler warnings.

Adjusting SHOW CREATE TABLE output from 5.0 to 5.1 format

into  mysql.com:/home/bar/mysql-work/mysql-5.1.b31081

into  mysql.com:/home/bar/mysql-work/mysql-5.0.b31081

into  mysql.com:/home/bar/mysql-work/mysql-5.1.b27287

into  koti.dsl.inet.fi:/home/elkin/MySQL/merge-5.1

similar to bug_27716, but it was stressed on in the synopsis on that there is another
side of the artifact affecting behaviour in transaction.

Fixed with deploying multi_delete::send_error() - otherwise never called - and refining its logic
to perform binlogging job if needed.

The changeset includes the following side effects:
- added tests to check bug_23333's scenarios on the mixture of tables for multi_update;
- fixes bug@30763 with two-liner patch and a test coinciding to one added for bug_23333.

Post-merge fixes. Setting write bit before calling Field::store() since the function asserts that
the write bit has been set.

into  kindahl-laptop.dnsalias.net:/home/bkroot/mysql-5.1-rpl

into  kindahl-laptop.dnsalias.net:/home/bk/b29549-mysql-5.1-target-5.1.22

Refactoring code to add parameter to pack() and unpack() functions with
purpose of indicating if data should be packed in little-endian or
native order. Using new functions to always pack data for binary log
in little-endian order. The purpose of this refactoring is to allow
proper implementation of endian-agnostic pack() and unpack() functions.

Eliminating several versions of virtual pack() and unpack() functions
in favor for one single virtual function which is overridden in
subclasses.

Implementing pack() and unpack() functions for some field types that
packed data in native format regardless of the value of the
st_table_share::db_low_byte_first flag.

The field types that were packed in native format regardless are:
Field_real, Field_decimal, Field_tiny, Field_short, Field_medium,
Field_long, Field_longlong, and Field_blob.

Before the patch, row-based logging wrote the rows incorrectly on
big-endian machines where the storage engine defined its own
low_byte_first() to be FALSE on big-endian machines (the default
is TRUE), while little-endian machines wrote the fields in correct
order. The only known storage engine that does this is NDB. In effect,
this means that row-based replication from or to a big-endian
machine where the table was using NDB as storage engine failed if the
other engine was either non-NDB or on a little-endian machine.

With this patch, row-based logging is now always done in little-endian
order, while ORDER BY uses the native order if the storage engine
defines low_byte_first() to return FALSE for big-endian machines.

In addition, the max_data_length() function available in Field_blob
was generalized to the entire Field hierarchy to give the maximum
number of bytes that Field::pack() will write.

Problem: rpl_stm_mystery22 is unstable.

Reason: At one place, the test case *should* wait until the SQL thread on the
slave receives an error, but instead it waits until the SQL thread stops. The
SQL thread may stop before the error flag is set, so that when the test case
continues to execute, the error flag is not set.

Fix: Introduce the subroutine mysql-test/include/wait_for_slave_sql_error.inc,
which waits until there is an error in the sql thread of the slave.

Re-commit: fixed one logical error and two smaller things noted by Mats.

Performance improvements made.
ExtractValue for large XML values is now much faster
(about 2000 times faster of 1Mb-long XML values).

Problem: The "regex" library written by Henry Spencer
does not support tricky character sets like UCS2.
Fix: convert tricky character sets to UTF8 before calling
regex functions.

into  koti.dsl.inet.fi:/home/elkin/MySQL/TEAM/FIXES/5.0/bug29309-wrong_master_timestamp

Report claims that Seconds_behind_master behaves unexpectedly. 

Code analysis shows that there is an evident flaw in that treating of FormatDescription event is wrong
so  that after FLUSH LOGS on slave the Seconds_behind_master's calculation slips and incorrect
value can be reported to SHOW SLAVE STATUS. 
Even worse is that the gap between the correct and incorrect deltas grows with time.

Fixed with prohibiting changes to rpl->last_master_timestamp by artifical events (any kind of).
suggestion as comments is added how to fight with lack of info on the slave side by means of
new heartbeat feature coming.

The test can not be done ealily fully determistic.

into  koti.dsl.inet.fi:/home/elkin/MySQL/TEAM/5.1-merge

Fix: ignore BOM marker in the first line.

into  koti.dsl.inet.fi:/home/elkin/MySQL/TEAM/FIXES/5.0/bug26000_show_slave_status_when_no_active_mi

into  koti.dsl.inet.fi:/home/elkin/MySQL/TEAM/FIXES/5.0/bug26000_show_slave_status_when_no_active_mi

Problem: one thread could read uninitialized memory from (the stack of) another
thread.
Fix: swapped order of initializing the memory and making it available to the
other thread.
Fix: put lock around the statement that makes the memory available to the other
thread.
Fix: all fields of the struct are now initialized in the constructor, to avoid
future problems.

into  mysql.com:/home/bar/mysql-work/mysql-5.1-new-rpl

into  mysql.com:/home/bar/mysql-work/mysql-5.0-rpl

into  mysql.com:/home/bar/mysql-work/mysql-5.1-new-rpl

Removing redundant initialization.

Problem: some valid euc-kr characters were rejected because
condition checking multi-byte tail didn't allow 
multi-byte characters having the second byte in the ranges
[0x41..0x5A]  and [0x61..0x7A].

Fix: allow these byte ranges for mb tails