[ticket/10772] Use forum specific style for trigger_error

PHPBB3-10772
[ticket/develop/10772] Unit tests for forum specific style

Unit tests for forum specific style for 3.1 branch

PHPBB3-10772
Merge branch 'ticket/10772' into ticket/develop/10772

* ticket/10772:
  [ticket/10772] Use forum specific style for trigger_error
[ticket/develop/10772] Fix copyright year

PHPBB3-10772
[ticket/10772] Functional tests for forum style

PHPBB3-10772
[ticket/10772] Remove unnecessary comment

PHPBB3-10772
Merge remote-tracking branch 'remotes/cyberalien/ticket/10772' into develop-olympus

# By Vjacheslav Trushkin
# Via Vjacheslav Trushkin
* remotes/cyberalien/ticket/10772:
  [ticket/10772] Remove unnecessary comment
  [ticket/10772] Functional tests for forum style
  [ticket/10772] Use forum specific style for trigger_error
Merge remote-tracking branch 'remotes/cyberalien/ticket/develop/10772' into develop

# By Vjacheslav Trushkin
# Via Vjacheslav Trushkin
* remotes/cyberalien/ticket/develop/10772:
  [ticket/develop/10772] Fix copyright year
  [ticket/develop/10772] Unit tests for forum specific style
  [ticket/10772] Use forum specific style for trigger_error
Merge branch 'develop-olympus' into develop

# By Vjacheslav Trushkin
# Via Nathaniel Guse (1) and Vjacheslav Trushkin (1)
* develop-olympus:
  [ticket/10772] Remove unnecessary comment
  [ticket/10772] Functional tests for forum style

Conflicts:
	tests/functional/forum_style_test.php