[ticket/12589] Search directly in $directory if it's an absolute sub-path

PHPBB3-12589
[ticket/12589] Fix tests

PHPBB3-12589
[ticket/12589] Add test searching in a non absolute directory

PHPBB3-12589
[ticket/12637] Correctly escape the file header in coding-guidelines.html.

PHPBB3-12637
[ticket/12637] Fixup all incorrect uses of file header.

PHPBB3-12637
Merge pull request #2524 from bantu/ticket/12637

[ticket/12637] Correct file header in coding-guidelines

* bantu/ticket/12637:
  [ticket/12637] Fixup all incorrect uses of file header.
  [ticket/12637] Correctly escape the file header in coding-guidelines.html.
[develop-ascraeus] Correct capitalisation of NeoThermic.
Merge pull request #2494 from Nicofuma/ticket/12589

[ticket/12589] Search directly in $directory if it's an absolute sub-path

* Nicofuma/ticket/12589:
  [ticket/12589] Add test searching in a non absolute directory
  [ticket/12589] Fix tests
  [ticket/12589] Search directly in $directory if it's an absolute sub-path
[ticket/12641] Use jQuery's trim() method. IE8 does not support the native one

PHPBB3-12641
Merge pull request #2529 from prototech/ticket/12641

[ticket/12641] Use jQuery's trim() method. IE8 does not support the native one.

* prototech/ticket/12641:
  [ticket/12641] Use jQuery's trim() method. IE8 does not support the native one
[ticket/12566] "Private messages" should be "Send pivate message"

PHPBB3-12566
[ticket/12566] Also changed for ucp_pm_viewmessage.php

PHPBB3-12566
Merge remote-tracking branch 'PayBas/ticket/12566' into develop-ascraeus

* PayBas/ticket/12566:
  [ticket/12566] Also changed for ucp_pm_viewmessage.php
  [ticket/12566] "Private messages" should be "Send pivate message"