* EXreaction/feature/migrations: (48 commits)
[feature/migrations] Remove default values from necessary parameters
[feature/migrations] Revert unrelated changes to functions.php
[ticket/9737] Fix some comments
[ticket/9737] Fix a few minor things in migrations
[feature/migrations] Make sure migration data not done before running data step
[feature/migrations] Function to populate the migrations table (for install)
[feature/migrations] Function effectively_installed() in migrations
[feature/migrations] Make load_migrations recursive (optionally)
[feature/migrations] Make the test depends_on methods static
[feature/migrations] Make depends_on static to call it without dependencies
[feature/migrations] install/database_update_migrations.php
[feature/migrations] Move test.php -> install/database_update_migrations.php
[feature/migrations] Store depends on in the database (serialized)
[feature/migrations] Revert method completed
[feature/migrations] Basic reverting test
[feature/migrations] Test for calling a step multiple times
[feature/migrations] Creating revert method to attempt reverting a migration
[feature/migrations] Some comments in db_tools
[feature/migrations] Reverse data functionality
[feature/migrations] Comment
...
Conflicts:
phpBB/install/schemas/firebird_schema.sql
phpBB/install/schemas/mssql_schema.sql
phpBB/install/schemas/mysql_40_schema.sql
phpBB/install/schemas/mysql_41_schema.sql
phpBB/install/schemas/oracle_schema.sql
phpBB/install/schemas/postgres_schema.sql
phpBB/install/schemas/sqlite_schema.sql
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