[ticket/11323] Add tests for inclusion of defined variables

This adds 2 tests for the template engine. The test using
include_define_variable.html will test if a defined variable, which was
defined with another template variable, can be used to include a file.
The second test will do the same inside a loop using a loop variable.

PHPBB3-11323
Merge PR #1194 branch 'marc1706/ticket/11323' into develop-olympus

# By Marc Alexander
# Via Marc Alexander
* marc1706/ticket/11323:
  [ticket/11323] Add tests for inclusion of defined variables
Merge PR #1194 branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11323] Add tests for inclusion of defined variables
[ticket/10786] Render search options by default on memberlist.php

Search functions on the memberlist.php page are now rendered by default and displayed via javascript.  If javascript is disabled the page still works as it previously did.
[ticket/10786] Javascript toggle member search panel in memberlist.php

Search functions on the memberlist.php page are now rendered by default and displayed via javascript.  If javascript is disabled the page still works as it previously did.

http://tracker.phpbb.com/browse/PHPBB3-10786
[ticket/10786] Javascript toggle member search panel in memberlist.php

Search functions on the memberlist.php page are now rendered by default and displayed via javascript.  If javascript is disabled the page still works as it previously did.

http://tracker.phpbb.com/browse/PHPBB3-10786