[ticket/12382] Add template test for subloops inside events

PHPBB3-12382
[ticket/12389] Move print topic & email topic icons to topic tools

PHPBB3-12389
[ticket/12389] Change language of email friend

PHPBB3-12389
[ticket/12382] Add template test for subloops inside includes

PHPBB3-12382
[ticket/12382] Mark broken nested loop with include as incomplete

PHPBB3-12382
[ticket/8960] Allow changing avatar path if it's not writable

This change will allow users to change the avatar path even if it's not
writable. However, this will get rid of the error message that the path is
not writable. Due to this, a minor addition to the explain message in the ACP
settings has been made.

PHPBB3-8960
Merge branch 'ticket/8960-olympus' into ticket/8960

Conflicts:
	phpBB/includes/acp/acp_board.php
[ticket/8558] Add display name in emails from board

PHPBB3-8558
[ticket/8558] Do string concatenation only once and do htmlspecialchars

PHPBB3-8558
[ticket/12404] Adds a new event before and after the Timezone display

PHPBB3-12404
[ticket/12406] Fix variable description of core.viewtopic_modify_page_title

Variable page_title should be described as "Title of the viewtopic page".

PHPBB3-12406
[ticket/12012] Correctly drop default value constraints on MSSQL

We need to drop the default constraints of a column,
before being able to change their type or deleting them.

PHPBB3-12012
[ticket/12012] Fix query layout

PHPBB3-12012
[ticket/12012] Drop and recreate indexes when changing a column on MSSQL

PHPBB3-12012
[ticket/12012] Fix tools::mssql_get_existing_indexes() for SQL Server 2000

PHPBB3-12012
[ticket/12012] Return SQL statements for index drop/create

Otherwise we recreate the index before changing the column

PHPBB3-12012
[ticket/12012] Add a unit test for changing the column type

PHPBB3-12012
[ticket/12012] Add a unit test for removing a column with indexes

PHPBB3-12012
[ticket/12012] Drop and recreate indexes when removing columns

PHPBB3-12012
[ticket/12012] Handle begin and commit transactions in tests

PHPBB3-12012