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'"

Merged the majority of the PFS test cases.
There are still 19 failing test cases that need more attention.

-Note 1031 Table storage engine for 't1' doesn't have this option
+Note 1031 Table storage engine for 'InnoDB' doesn't have this option

They were caused by a change in MariaDB which changed ER_ILLEGAL_HA message 
text to be like:
"Storage engine InnoDB of the table `test`.`t1` doesn't have this option"

Some the error calls were changed to pass new parameters, but some were left
to be old. Also the error text in errmsg-ut8.txt was not changed.

- Update test results for tests using SPs: SPs no longer
  emit warnings/errors that were caught and handled inside SP

- New error message text
- PARTITION is now a reserved word in SQL, so it should be quoted

- Update trivial .reject/.result differences (all checked)

must use C++ linking due to client library using SSL library, which needs
C++ linking

- Take into account that Dynamic_array::back() now returns 
  pointer to the last element (it used to return pointer to 
  right after the last element)
- Fix error messages merge: ER_INTERNAL_ERROR was defined 
  independently by both mysql-5.6 and mariadb-5.5. Switch 
  to their error number, and still support ours for compatibility.