[ticket/11864] Do not call exit after display_progress_bar in acp_forums

The progress bar is called with the method display_progress_bar() in the
acp_forums files. This method then call adm_page_footer() which also calls
exit_handler(). Therefore, the exit; in acp_forums after
$this->display_progress_bar() is obsolete and shouldn't exist in the first
place.

PHPBB3-11864
[ticket/11862] Correct var names in user_delete() events due to prune-users

The prune-users feature modified the names of the used variables in this
function. However, the variable names for the two events in this function
were not changed to reflect that. This patch will take care of it.

PHPBB3-11862
[ticket/11868] Replace phpbb_request_interface references

PHPBB3-11868
[ticket/11868] Add functional test for registration

PHPBB3-11868
Merge pull request #3 from nickvergessen/ticket/cyberalien/11868

Ticket/cyberalien/11868
[ticket/11868] Add @depends to test

PHPBB3-11868
Merge remote-tracking branch 'cyberalien/ticket/11868' into develop

* cyberalien/ticket/11868:
  [ticket/11868] Add @depends to test
  [ticket/11868] Add functional test for registration
  [ticket/11868] Replace phpbb_request_interface references
Merge remote-tracking branch 'marc1706/ticket/11864' into develop-olympus

* marc1706/ticket/11864:
  [ticket/11864] Do not call exit after display_progress_bar in acp_forums
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11864] Do not call exit after display_progress_bar in acp_forums
[prep-release-3.0.12] Bumping version number for 3.0.12 final.
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [prep-release-3.0.12] Bumping version number for 3.0.12 final.

Conflicts:
	phpBB/includes/constants.php
	phpBB/install/database_update.php
	phpBB/install/schemas/schema_data.sql
[develop-olympus] Use 3.0.13-dev as build version. Use latest 3.0.12 RC tag.
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [develop-olympus] Use 3.0.13-dev as build version. Use latest 3.0.12 RC tag.
  [prep-release-3.0.12] Bumping version number for 3.0.12 final.

Conflicts:
	build/build.xml
	phpBB/install/database_update.php
Merge remote-tracking branch 'Marc/ticket/11862' into develop

* Marc/ticket/11862:
  [ticket/11862] Correct var names in user_delete() events due to prune-users