This commit is a highly-refactored and up-to-date version of Fyorl's work
which was part of his Google Summer of Code 2012 project "Attachment
Improvements".
PHPBB3-10929
* phpbb/develop:
[ticket/11867] Schema files are not created by create_schema_files.php
[ticket/11905] 3.1.0-a1 Migration
[ticket/11903] Speed up paging test
[ticket/11703] Extend the correct migration class.
[ticket/11874] Correct when $phpbb_root_path is appended to build_url()
[ticket/11703] Also use empty() for T_JQUERY_LINK.
[ticket/11703] Add effectively_installed().
[ticket/11703] Make jQuery CDN switch more generic.
[ticket/11874] Fix tests
[ticket/11874] Do not always prepend the web path; only replace phpbb_root_path
[ticket/11345] Don't include scheme, so HTTPS is used where necessary.
[ticket/11345] Wrap remote webfonts in S_ALLOW_CDN.
[ticket/11345] Move css import to template
[ticket/11345] Add Droid Sans as fallback font
[ticket/11345] Change font for buttons
Created a migration tips develop tool to help find the migration tree tips so
they can be copied to versions released.
With this, A1 is the only current tree tip (it depends on all other migrations).
PHPBB3-11905
* phpbb/develop: (542 commits)
[ticket/11901] Pass empty string as relative_url for non-local magic URL.
[ticket/11898] Correct adm_relative_path created by installer
[ticket/11898] Correct admin S_LOGIN_ACTION
[ticket/11892] Fix undefined variables: to_forum_id & to_topic_id
[ticket/11890] Fix untranslated string when deleting posts through MCP.
[ticket/11895] Fix undefined $forum_id
[ticket/10383] Update the results without the overlay popup.
[ticket/10383] Make the content transitions smoother.
[ticket/10383] AJAXify poll voting
[ticket/11888] Update default search backend in namespaces migration
[ticket/11739] Rename “Remember Me” login keys module
[ticket/11893] Remove unnecessary <fieldset> causing a large font size
[ticket/11894] Fix typo in "Delete post" option
[ticket/11888] Use \phpbb\search\fulltext_native as search backend config
[ticket/11608] Mark failed test as incomplete for mysql search backend
[ticket/11608] Update search backend class names to namespaces
[ticket/11608] Move markIncomplete to search backends test
[ticket/11608] Rename base search test class file
[ticket/11608] Remove suffix test from base class
[ticket/11608] Mark postgres search not found test as incomplete
...
Only the regular expression for MAGIC_URL_LOCAL has three capturing groups. As
a result $matches[3] is only set in this case. Prior to PHPBB3-11606 an empty
string was passed to make_clickable_callback() as a replacement in case of less
than three capturing groups. This patch reintroduces the empty string.
Regression from 49c12ef4be229bf2223139298766ef441b075fbc.
PHPBB3-11901
