do it on the upper level, in items that return temporal values.

update tests results to match 5.6 better and to fix old bugs.

it'll go away in the next 10.0 merge

add extra_func code from 5.5, that was lost in a merge

mysql 5.6.10 's part_table_io.result passes the test.

it shouldn't require LOCK_TABLE_ACL

Map ALTER ONLINE TABLE to ALTER TABLE ... ALGORITHM=INPLACE.
Make MERGE engine to announce its support of inplace operations.

Merged all perfschema tests, except for the following:
perfschema.part_table_io
perfschema.binlog_mix perfschema.binlog_row perfschema.binlog_stmt
perfschema.statement_digest_consumers perfschema.statement_digest
privilege.inc privilege.result

add missing rename_column_in_stat_tables(), delete_statistics_for_column(),
delete_statistics_for_index(), rename_table_in_stat_tables() calls.

do it only once

- Problem: mysql_admin_table() calls open_temporary_tables(). This 
  causes assertion failure, because mysql_execute_command() has 
  already called open_temporary_tables()
- Solution: call close_thread_tables() at the start of 
  mysql_admin_table(), like mysql-5.6 does 

Commented out the test case for bug 50036 as it was done in mysql-5.6.10.

- After the merge from mysql-5.6, open_tables() did not call
  open_and_process_table() for temporary table. The logic was that temporary
  tables were already opened when mysql_execute_command() has called 
  open_temporary_tables().
  This worked for the most part, except for temporary tables of type MERGE. for
  which open_and_process_table() must call 
    table->file->extra(HA_EXTRA_ADD_CHILDREN_LIST).
  Failure to make this call resulted in crash further in execution.

  tables->table->file->extra(HA_EXTRA_ADD_CHILDREN_LIST)
  

- Put back the code tht produces the warning about 
  "Table storage engine %s does not support the create option 'TRANSACTIONAL=1'"