Merge branch 'develop' into feature/avatars

* develop: (201 commits)
  [feature/new-tz-handling] Don't use global user but make it a parameter
  [feature/new-tz-handling] Fix size of suggestion button in chrome
  [feature/new-tz-handling] Fall back to UTC, if the timezone is invalid
  [feature/new-tz-handling] Add previous selected value to validation if valid
  [feature/new-tz-handling] Display suggestion when a different value is selected
  [ticket/10998] Add border-radius to forum rules block - prosilver
  [feature/new-tz-handling] Remove additional marking of selected items
  [feature/new-tz-handling] Move update helper function to new class
  [feature/new-tz-handling] Fix unit test
  [feature/new-tz-handling] Delete old variable which is not used anymore
  [feature/new-tz-handling] Rename $user->tz back to $user->timezone
  [feature/pagination-as-list] New parameter for name of start var
  [feature/pagination-as-list] Updates for nils comments
  [feature/pagination-as-list] Rename and deprecate functions
  [feature/pagination-as-list] Various fixes and improvements
  [ticket/10968] Render pagination within the template
  [feature/new-tz-handling] Remove "timezone might be numeric"
  [feature/new-tz-handling] Add function to update the timezone
  [feature/new-tz-handling] Correctly update user and board timezones on update
  [ticket/10996] Use correct DBMS name in Travis config for PostgreSQL
  ...

phpBB/install/schemas/oracle_schema.sql

@@ -1638,8 +1638,7 @@ CREATE TABLE phpbb_users (
 	user_inactive_time number(11) DEFAULT '0' NOT NULL,
 	user_posts number(8) DEFAULT '0' NOT NULL,
 	user_lang varchar2(30) DEFAULT '' ,
-	user_timezone number(5, 2) DEFAULT '0' NOT NULL,
-	user_dst number(1) DEFAULT '0' NOT NULL,
+	user_timezone varchar2(100) DEFAULT 'UTC' NOT NULL,
 	user_dateformat varchar2(90) DEFAULT 'd M Y H:i' NOT NULL,
 	user_style number(8) DEFAULT '0' NOT NULL,
 	user_rank number(8) DEFAULT '0' NOT NULL,