Fixed test_sql_discovery compilation failure.

storage/test_sql_discovery/mysql-test/archive/discover.rdiff:
  archive.discover result has changed during merge. Adjusted discover.rdiff
  accordingly.
storage/test_sql_discovery/test_sql_discovery.cc:
  Adjusted test_sql_discovery according to:
  WL#4305 - storage-engine private data area per physical table.

Fixed sequence compilation failure.

storage/sequence/sequence.cc:
  Adjusted sequence according to:
  WL#4305 - storage-engine private data area per physical table.

sql/sql_table.cc:
  Removed false assertion that HA_NO_COPY_ON_ALTER is merge specific.
  This flag is used at least by Spider and Connect.
storage/spider/ha_spider.cc:
  Renamed THD::stmt_da -> THD::get_stmt_da().
  Renamed KEY::key_parts -> KEY::user_defined_key_parts.
  Renamed ALTER_* flags -> Alter_info::ALTER_*.
storage/spider/spd_conn.cc:
  Renamed THD::stmt_da -> THD::get_stmt_da().
storage/spider/spd_db_conn.cc:
  Renamed MYSQL_ERROR -> Sql_condition.
  Renamed KEY::key_parts -> KEY::user_defined_key_parts.
storage/spider/spd_db_include.h:
  current_comment_start argument of generate_parition_syntax()
  was removed during merge.
storage/spider/spd_db_mysql.cc:
  Renamed KEY::key_parts -> KEY::user_defined_key_parts.
storage/spider/spd_ping_table.cc:
  Renamed THD::stmt_da -> THD::get_stmt_da().
storage/spider/spd_table.cc:
  Include my_getopt.h so that it exports my_defaults_file and
  my_defaults_extra_file.
  Renamed KEY::key_parts -> KEY::user_defined_key_parts.

* update results
* don't force HA_CREATE_DELAY_KEY_WRITE on all temp tables,
  (bad for CREATE ... LIKE) instead imply it in myisam/aria
* restore HA_ERR_TABLE_DEF_CHANGED in archive
* increase the default number of rwlock classes in P_S to fit all our rwlocks

includes:
* remove some remnants of "Bug#14521864: MYSQL 5.1 TO 5.5 BUGS PARTITIONING"
* introduce LOCK_share, now LOCK_ha_data is strictly for engines
* rea_create_table() always creates .par file (even in "frm-only" mode)
* fix a 5.6 bug, temp file leak on dummy ALTER TABLE

test suite added to be sure that bug is fixed

MDEV-4647: Valgrind warnings (Conditional jump or move depends on uninitialised value) in Item_equal::fix_fields
Fix to calm down valgrind.

(fix of http://bugs.mysql.com/bug.php?id=69623)

  
In the case of loose scan used as input for order by, end_send()
didn't detect correctly that a loose scan was used, and didn't copy
the non-aggregated fields from the temp table used for ORDER BY.
  
The fix uses the fact that the quick select used for sorting is
attached to JOIN::pre_sort_join_tab instead of JOIN::join_tab.

MDEV-4570 [PATCH] Sys_query_cache_limit initialization depends on initialization in other source files

 REFRESH_FAST do not fit in 32 bit

MDEV-4782: Valgrind warnings (Conditional jump or move depends on uninitialised value) with InnoDB, semijoin
- in sub_select(): don't call table->file->position() when reading the first record
  produced an error.

pfs unit test fixed.

Backport the fix olav.sandstaa@sun.com-20101102184747-qfuntqwj021imy9r:
"Fix for Bug#52660 Perf. regr. using ICP for MyISAM on range queries on an index containing TEXT" 
(together with further fixes in that code) into MyISAM and Aria.

mdev-4173: Wrong result (extra row) with semijoin=on, joins in outer query, LEFT JOIN in the subquery
Apply the patch from Patryk Pomykalski:
- create_internal_tmp_table_from_heap() will now return information whether
  the last row that we tried to write was a duplicate row.
(mysql-5.6 also has this change)

misses GEOMETRY columns.

Includes 5.6 changesets for:
*****
Fix for BUG#13489996 valgrind:conditional jump or move depends on uninitialised values-field_blob.
blob_ptr_size was not initialized properly: remove this variable.
*****
Bug#14021323 CRASH IN FIELD::SET_NULL WHEN INSERTING ROWS TO NEW TABLE
*****

- Make JOIN::cleanup(true) also work correctly when the query is KILLed
  after join optimization was started but before a query plan was produced

merging tests from 5.6

a different fix for
    Bug#14069132 : STATEMENT DIGESTS DUPLICATE CALL STATEMENTS OF THE SAME NORMALIZED FORM