Attempt to make it easier to upgrade mysql->mariadb on Ubuntu precise.
It looks like we were missing conflicts: and replaces: on packages
mysql-server-5.5 and mysql-client-5.5.

make sure that find_date_time_item() is called before agg_arg_charsets_for_comparison().
optimize Item_func_conv_charset to avoid conversion if no string result is needed

On localized Windows versions, Windows uses localized time zone names and contain non-ASCII characters.  non-ASCII characters appear broken when displayed by clients
The fix is to declare system_time_zone variable to have UTF8 encoding and to convert tzname to UTF8.

mysql-test/suite/sphinx/sphinx.result:
  Removed sphinx_time, as it was depending on timing.
mysql-test/suite/sphinx/sphinx.test:
  Removed sphinx_time, as it was depending on timing.

mysqldump with --include-master-host-port putting quotes around port number
Patch from Stewart Smith

client/mysqldump.c:
  Remove quotes from MASTER_PORT

Fixed MDEV-306 / LP:1007967 - Assertion `table->file->stats.records > 0 || error' failed join_read_const_table on concurrent SELECT and DROP/ADD INDEX


sql/sql_table.cc:
  Added comment
storage/maria/ma_close.c:
  Don't store history if it's visible to all.
  This fixed the MDEV-306 bug
storage/maria/ma_delete_table.c:
  Removed old comment
  Delete history state for deleted tables
storage/maria/ma_info.c:
  More DBUG_PRINT
storage/maria/ma_open.c:
  More DBUG_PRINT

Percona-Server 5.5.24-rel26.0

The class Item_func missed an implementation of the virtual 
function update_null_value.
Back-ported the fix for bug 62125 from mysql 5.6 code line.
The test case was also back-ported. 

- Add the VIA_SYM token into keyword_sp list, which makes it allowed for
  use as keyword and SP label.

The bug prevented acceptance of UNION queries whose non-first select 
clauses contained join expressions with degenerated single-table nests
as valid queries.
The bug was introduced into mysql-5.5 code line by the patch for
bug 33204.

Fixed MDEV-331: last_insert_id() returns a signed number

mysql-test/r/auto_increment.result:
  Added test case
mysql-test/t/auto_increment.test:
  Added test case
sql/item_func.h:
  Changed last_insert_id() to be unsigned.

LP1008334 : Speedup specific datetime queries that got slower with introduction of microseconds in 5.3

- Item::get_seconds() now skips decimal arithmetic, if decimals is 0. This significantly speeds up from_unixtime() if no fractional part is passed.
- replace sprintfs used to format temporal values  by hand-coded formatting 
  
Query1 (original query in the bug report)
BENCHMARK(10000000,DATE_SUB(FROM_UNIXTIME(RAND() * 2147483648), INTERVAL (FLOOR(1 + RAND() * 365)) DAY)) 
  
Query2 (Variation of query1 that does not use fractional part in FROM_UNIXTIME parameter)
BENCHMARK(10000000,DATE_SUB(FROM_UNIXTIME(FLOOR(RAND() * 2147483648)), INTERVAL (FLOOR(1 + RAND() * 365)) DAY)) 
  
Prior to the patch, the runtimes were (32 bit compilation/AMD machine)
Query1: 41.53 sec 
Query2: 23.90 sec
  
With the patch, the runtimes are
Query1: 32.32 sec (speed up due to removing sprintf)
Query2: 12.06 sec (speed up due to skipping decimal arithmetic)

The --debug-no-sync incorrectly defaulted to ON, disabling sync calls
by default which can loose data or cause corruption. Also, the code
used fsync() instead of the sometimes more efficient fdatasync().

look for plugins in the correct path.
skip --plugin-load if it has the empty soname part, not only if the whole argument is empty.

  
simplify debian/dist/*/rules slightly.
move hard-coded config value to cmake files.
(the actual fix is -DBUILD_CONFIG=mysql_release)

Analysis:

When the method JOIN::choose_subquery_plan() decided to apply
the IN-TO-EXISTS strategy, it set the unit and select_lex
uncacheable flag to UNCACHEABLE_DEPENDENT_INJECTED unconditionally.
As result, even if IN-TO-EXISTS injected non-correlated predicates,
the subquery was still treated as correlated.

Solution:
Set the subquery as correlated only if the injected predicate(s) depend
on the outer query.

remove the offending assert.
take the test case from mysql Bug#58015

backport dmitry.shulga@oracle.com-20120209125742-w7hdxv0103ymb8ko from mysql-trunk:

  Patch for bug#11764747 (formerly known as 57612): SET GLOBAL READ_ONLY=1 cannot
  progress when a table is locked with LOCK TABLES.
  
  The reason for the bug was that mysql server makes a flush of all open tables
  during handling of statement 'SET GLOBAL READ_ONLY=1'. Therefore if some of
  these tables were locked by "LOCK TABLE ... READ" from a different connection,
  then execution of statement 'SET GLOBAL READ_ONLY=1' would be waiting for
  the lock for such table even if the table was locked in a compatible read mode.
  
  Flushing of all open tables before setting of read_only system variable
  is inherited from 5.1 implementation since this was the only possible approach
  to ensure that there isn't any pending write operations on open tables.
  
  Start from version 5.5 and above such behaviour is guaranteed by the fact
  that we acquire global_read_lock before setting read_only flag. Since
  acquiring of global_read_lock is successful only when there isn't any 
  active write operation then we can remove flushing of open tables from
  processing of SET GLOBAL READ_ONLY=1.
  
  This modification changes the server behavior so that read locks held
  by other connections (LOCK TABLE ... READ) no longer will block attempts
  to enable read_only.

Take only test cases from MDEV-136 Non-blocking "set read_only"

Analysis:
The crash is a result of Item_cache_temporal::example not being set
(it is NULL). It turns out that the value of Item_cache_temporal
may be set directly by calling Item_cache_temporal::store_packed
without ever setting the "example" of this Item_cache. Therefore
the failing assertion is too narrow.

Solution:
Remove the assert.
In principle we could overwrite this method for Item_cache_temporal,
but it doesn't make sense just for this assert.

- Set index columns to be read when using index_merge, even if TABLE->no_keyread is 
  set for the table (happens for multi-table UPDATEs)