[prep-release-3.0.12] Bumping version number for 3.0.12-RC2.
[prep-release-3.0.12] Update Changelog for 3.0.12-RC2 release.
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [prep-release-3.0.12] Update Changelog for 3.0.12-RC2 release.
  [prep-release-3.0.12] Bumping version number for 3.0.12-RC2.

Conflicts:
	phpBB/includes/constants.php
	phpBB/install/database_update.php
	phpBB/install/schemas/schema_data.sql
Merge branch 'prep-release-3.0.12' of git://github.com/phpbb/phpbb3 into prep-release-3.0.12

* 'prep-release-3.0.12' of git://github.com/phpbb/phpbb3:
  [ticket/11753] Remove ?> from MySQL Upgrader.
  [ticket/11753] Update MySQL upgrader schema data.
  [ticket/11524] Add another isset() to mitigate "Illegal string offset 'limit'"
  [ticket/11752] HTTP -> HTTPs in email/installed.txt
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
[ticket/11762] Use the === operator to distinguish "0" from ""

PHPBB3-11762
[ticket/11762] Fixed test's filename

PHPBB3-11762
[ticket/11762] Added call to test class's parent::setUp().

Added call to test class's parent::setUp(). Updated copyright year.

PHPBB3-11762
Merge remote-tracking branch 's9e/ticket/11762' into develop-olympus

* s9e/ticket/11762:
  [ticket/11762] Added call to test class's parent::setUp().
  [ticket/11762] Fixed test's filename
  [ticket/11762] Use the === operator to distinguish "0" from ""