[ticket/10854] sql server drop default constraint when dropping column

drops default columns with T-SQL before attempting drop column to
avoids sql exception.  This is a huge annoyance in UMIL scripts running
under sql server.
[ticket/10431] CSS3 buttons

CSS3 replacements for big buttons

PHPBB3-10431
[ticket/10431] Different font for iOS

Different font for buttons on iOS devices because Verdana looks
incorrectly aligned in Safari/iOS. Also slightly changed text shadow.

PHPBB3-10431
[ticket/10431] Adjustments for IE7

Adjustments to buttons for IE7

PHPBB3-10431
[ticket/10431] Changed fonts for Linux

Added backup fonts for Linux systems that do not have Verdana font

PHPBB3-10431
[ticket/11295] Drop tables rather than database for postgres in test suite.

Doing so allows:

1. User running the tests no longer needs create database privilege.
2. Test database may be located in a non-default tablespace and generally
have site-specific options applied to it.

PHPBB3-11295
[feature/migrations] Basic migrations with schema and data changes

The migrator takes care of applying migrations as necessary.

RFC: http://area51.phpbb.com/phpBB/viewtopic.php?f=84&t=41337

PHPBB3-9737
[feature/migrations] Store start and end time of migrations

PHPBB3-9737
[feature/migrations] Return schema changes in database update style array

Returning the set of schema changes allows potentially aggregating to generate
the overall install schema automatically from a set of migrations

PHPBB3-9737
[feature/migrations] Standard vars for migrations and run sql with feedback

PHPBB3-9737
[feature/migrations] Moved database_update info to individual migration classes
[feature/migrations] Some migrations data

PHPBB3-9737
[feature/migrations] 3.0.8-rc1 migration, fix some calls

PHPBB3-9737
[feature/migrations] Migrations back through 3.0.6

PHPBB3-9737
[feature/migrations] Use $this->db

PHPBB3-9737
[feature/migrations] Depend on part2

PHPBB3-9737
[feature/migrations] Update 3.0.3-3.0.5 migrations to work
[feature/migrations] Rename classes, depends on

PHPBB3-9737
[feature/migrations] Change migration data processing to run step by step
[feature/migrations] Remove references as it is now 3.1 code

PHPBB3-9737