[ticket/12982] Refactoring: made most JS nice.

PHPBB3-12982
[ticket/12982] Refactoring: made JS in adm nice

PHPBB3-12982
[ticket/12982] Refactoring: Cleaned up phpbb.search

PHPBB3-12982
[ticket/12982] Refactoring: Cleaned up forum_fn.js

PHPBB3-12982
[ticket/12982] Refactoring: Cleaned up crazy insert users stuff

PHPBB3-12982
[ticket/12982] Refactoring: Killed undescriptive variables

PHPBB3-12982
[ticket/12734] Remove unnecessary error supressing

PHPBB3-12734
[ticket/13009] Remove legacy browser hacks

PHPBB3-13009
[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

PHPBB3-13057
Merge pull request #2944 from Nicofuma/ticket/13057

[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

* Nicofuma/ticket/13057:
  [ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php
Merge pull request #2941 from Senky/ticket/12734

[ticket/12734] Custom profile manager should not suppress errors when inserting user rows

* Senky/ticket/12734:
  [ticket/12734] Remove unnecessary error supressing
Merge pull request #2879 from callumacrae/ticket/12982

[ticket/12982] JS refactoring
[ticket/13058] Add min value to jump to page input

PHPBB3-13058
Merge remote-tracking branch 'Nicofuma/ticket/13058' into develop-ascraeus

* Nicofuma/ticket/13058:
  [ticket/13058] Add min value to jump to page input
Merge remote-tracking branch 'hanakin/ticket/13009' into develop-ascraeus

* hanakin/ticket/13009:
  [ticket/13009] Remove legacy browser hacks
[ticket/13040] Fix W3C validator warning in overall_footer.html

Added a non-breaking space to remove the following warning:
**Empty heading.**

```html
<h3 class="alert_title"></h3><p class="alert_text"></p>
```

PHPBB3-13040
Merge remote-tracking branch 'prototech/ticket/13040' into develop-ascraeus

* prototech/ticket/13040:
  [ticket/13040] Fix W3C validator warning in overall_footer.html
[ticket/13065] Fix rehashing of stored password hash in phpBB2 convertor.

PHPBB3-13065
[ticket/13019] Always accept a reason for deleting a post/topic.

PHPBB3-13019
[ticket/13019] Rename deletion reason label.

PHPBB3-13019