Merge pull request #1764 from EXreaction/ticket/11874

[ticket/11874] Do not always prepend the web path; only replace phpbb_root_path
[ticket/11905] 3.1.0-a1 Migration

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
Merge pull request #1767 from EXreaction/ticket/11905

[ticket/11905] 3.1.0-a1 Migration
[feature/passwords] Add phpass copyright notice to salted md5 driver

PHPBB3-11610
[ticket/11906] Add missing configs from notifications cron to schema_data.sql

PHPBB3-11906
[ticket/11906] Add notification purge cron to cron tasks

PHPBB3-11906
[ticket/11867] Schema files are not created by create_schema_files.php

PHPBB3-11867
Merge remote-tracking branch 'nickvergessen/ticket/11867' into develop

# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/11867:
  [ticket/11867] Schema files are not created by create_schema_files.php
[feature/passwords] Mark old hashing functions as deprecated

PHPBB3-11610
[feature/passwords] Remove obsolete hashing functions from functions.php

These hashing functions have been worked into the salted md5 driver.

PHPBB3-11610
[ticket/11906] Fix namespace issues in prune_notifications

PHPBB3-11906
[ticket/11621] Use effectively_installed() instead.

PHPBB3-11621
Merge remote-tracking branch 'phpbb/develop' into ticket/11621

* 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
[ticket/11621] Put mysql_fulltext_drop into alpha1 migration.

PHPBB3-11621
Merge remote-tracking branch 'nickvergessen/ticket/11906' into develop

# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/11906:
  [ticket/11906] Fix namespace issues in prune_notifications
  [ticket/11906] Add notification purge cron to cron tasks
  [ticket/11906] Add missing configs from notifications cron to schema_data.sql
[ticket/11908] Namespacify phpbb_auth_provider_oauth_service_exception.

PHPBB3-11908
[feature/plupload/cron] Add cronjob for cleaning plupload temporary directory.

PHPBB3-10929
Merge remote-tracking branch 'bantu/ticket/11908' into develop

# By Andreas Fischer
# Via Andreas Fischer
* bantu/ticket/11908:
  [ticket/11908] Namespacify phpbb_auth_provider_oauth_service_exception.
[feature/plupload/cron] Namespacification

PHPBB3-10929
[ticket/11621] Correct GPLv2 link in file header.

PHPBB3-11621