[ticket/10729] Update post_edit_user when user being deleted

PHPBB3-10729
[ticket/10729] Update message_edit_user when user being deleted

PHPBB3-10729
Merge branch 'ticket/10729' into ticket/10729-2

Conflicts:
	phpBB/includes/functions_user.php
[ticket/10729] Update *_delete_user when user being deleted

PHPBB3-10729
[ticket/10729] Fix doc block for user_delete

PHPBB3-10729
[ticket/10729] Add tests for user posts, reports and attachments

PHPBB3-10729
[ticket/10729] Add tests for some special tables with unique conditions

PHPBB3-10729
[ticket/10729] Add assert messages and finish up tests

PHPBB3-10729
[ticket/10729] Ensure that no bans exist before testing create_session

PHPBB3-10729
[ticket/10729] Use mocked null cache for phpunit 3.6 on travis with php 5.2

PHPBB3-10729
Merge branch 'ticket/10729' into ticket/10729-asc

Conflicts:
	phpBB/includes/functions_user.php
[ticket/10729] Update fixture to 3.1 database structure

PHPBB3-10729
[ticket/10729] Fix setup of the tests for 3.1

PHPBB3-10729
[ticket/10729] Fix handling of third parameter in 3.1

PHPBB3-10729
[ticket/10729] Also test *delete_user on posts and topics

PHPBB3-10729
Merge pull request #2981 from nickvergessen/ticket/10729

Ticket/10729 Update editor information when user being deleted
Merge pull request #2984 from nickvergessen/ticket/10729-asc

[3.1][ticket/10729] Update editor information when user being deleted
Merge branch 'develop-olympus' into develop-ascraeus