[ticket/9341] Correctly named template vars

PHPBB3-9341
[ticket/9341] Use U_PREVIOUS and U_NEXT in template files

PHPBB3-9341
[ticket/11615] Rename init_test to creation_test for clarity

PHPBB3-11615
[ticket/11615] Rename class in file to match

PHPBB3-11615
[ticket/11615] Remove magic number in creation_test

Removing this magic number to its own variable
with clean multiplication makes it clear
what the number represents.

PHPBB3-11615
[ticket/11615] Fix typo in creation_test

PHPBB3-11615
[ticket/9341] Move create_topic and post into functional test case

create_topic and create_post are moved into functional test case
so that they can be used by other tests as well

PHPBB3-9341
[ticket/9341] Add tests for checking Next and Previous template vars

PHPBB3-9341
Merge remote-tracking branch 'asperous/ticket/11615/creation_test' into develop-olympus

* asperous/ticket/11615/creation_test:
  [ticket/11615] Fix typo in creation_test
  [ticket/11615] Remove magic number in creation_test
  [ticket/11615] Rename class in file to match
  [ticket/11615] Rename init_test to creation_test for clarity
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11615] Fix typo in creation_test
  [ticket/11615] Remove magic number in creation_test
  [ticket/11615] Rename class in file to match
  [ticket/11615] Rename init_test to creation_test for clarity
Merge remote-tracking branch 'asperous/ticket/11615/creation_test' into develop-olympus

* asperous/ticket/11615/creation_test:
  [ticket/11615] Fix typo in creation_test
  [ticket/11615] Remove magic number in creation_test
  [ticket/11615] Rename class in file to match
  [ticket/11615] Rename init_test to creation_test for clarity
Merge branch 'develop-olympus' into develop

* develop-olympus:
[ticket/11618] Replace glob() with scandir() and string matching

Removes glob from template tests as glob() does not work on all
systems according to PHP documentation as has been noticed by users.

PHPBB3-11618
Merge remote-tracking branch 'Hardolaf/ticket/11618' into develop-olympus

* Hardolaf/ticket/11618:
  [ticket/11618] Replace glob() with scandir() and string matching
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11618] Replace glob() with scandir() and string matching

Conflicts:
	tests/template/template_test.php
[ticket/9341] remove PREV_PAGE tpl var used for backward compatability

PHPBB3-9341
[ticket/9341] Follow the Next/Prev link in tests
follow the next/prev link and then assert if the page contains
its last post or not

PHPBB3-9341
[ticket/9341] Assert that page doesnt contain next or prev page posts

PHPBB3-9341
[ticket/11593] initialize $is_expr as null before being passed to get_varref

PHPBB3-11593
Merge remote-tracking branch 'dhruvgoel92/ticket/11593' into develop

* dhruvgoel92/ticket/11593:
  [ticket/11593] initialize $is_expr as null before being passed to get_varref