Fix tear down foreign key constraint violation exception tests

[DBAL-1024] Add more foreign key constraint violation error codes

[DBAL-1028] Fix fetching NULL values via fetchColumn()

[DBAL-1029] Fix foreign key referential action SQL on SQL Server and SQL Anywhere

[DBAL-1023] Fix line separators

[DBAL-1025] Allow connecting without database name for sqlanywhere driver

[DBAL 930] Only introspect accessible schema objects in PostgreSQL

[DBAL-944] Fix table column alteration on DB2

Fix return type of Connection::project

Add test to verify null cast in boolean type

Update from master main repository

fix quoted sequence name

[DBAL-1022] Wrap PDOException in PDOConnection::exec()

Enabled placeholders for "in" method in ExpressionBuilder

some format changes to trigger travis-cl once more again

I take the guess an use the information_schema. It makes it more clear and simple

correct table identifier

missing table identifier added

If the database have different schemes, with objects, that the actual logged in user has no rights, the existing statements will collect all objects (sequences and tables) and try to read them in later steps. This will throws exceptions. The reason for that is the fact, that both procedures getListSequencesList() and getListTablesSQL() will receive all known database objects from postgres catalogs. But the actual logged-in user, maby has no read permissions to object inside other scheme-owner. The additional parts inside both sql-statements will reduce the result to only objects that the user are able to see.

doModifyLimitQuery() was missing an outer "ORDER BY doctrine_rownum"

Close #654

[DBAL-1004] Fix generating COMMENT ON COLUMN statements for quoted identifiers