[ticket/12384] Run Travis CI HHVM tests against MySQLi instead of MySQL.

HHVM MySQLi has been fixed and works for us now.

PHPBB3-12384
[ticket/11942] Delete post/topic reason should be added to logs

https://tracker.phpbb.com/browse/PHPBB3-11942

PHPBB3-11942
[ticket/11942] Adding the reason to hard deleted topic/post

PHPBB3-11942
[ticket/11942] Change the formulation

PHPBB3-11942
[ticket/11942] Edits messages

PHPBB3-11942
[ticket/12174] Update topic_attachment flag when a post is soft-deleted

https://tracker.phpbb.com/browse/PHPBB3-12174

PHPBB3-12174
[ticket/12174] Corrections

PHPBB3-12174
[ticket/12174] Revert the changes on $topic_update_array

PHPBB3-12174
[ticket/12174] Update sql query

PHPBB3-12174
[ticket/12174] Remove inline assignment

PHPBB3-12174
[ticket/12174] Update the conditions

PHPBB3-12174
[ticket/12174] Don't update the flag for a post without attachment

PHPBB3-12174
[ticket/12174] Remove $update_topic_attachments_flag

PHPBB3-12174
[ticket/11226] filespec::move_file() should error correctly

PHPBB3-11226
[ticket/10899] Using Delete All in log viewer with keyword search

https://tracker.phpbb.com/browse/PHPBB3-10899

PHPBB3-10899
[ticket/10899] Refactoring in \phpbb\log\log_interface

PHPBB3-10899
[ticket/10899] Typo

PHPBB3-10899
[ticket/10899] Remove extra ';'

PHPBB3-10899
[ticket/11226] Use $user->lang()

PHPBB3-11226
[ticket/12174] Coding style

PHPBB3-12174