Postgres fix for a possible unavailable dbname

Added query micro-optimization

Fixed a PHP warning in DBALException::driverExceptionDuringQuery()

added index flags to schema table

fixed bug on schema comparator, prevent multiple rename candidates for a single original field

[DBAL-264] Support for UIDs in PostgreSQL

Add getGuidExpression() to PostgreSqlPlatform so that UUID support
works properly

fix function name in exception text

This reverts commit 0b6a6aef.

[DBAL-497] Fixed SQL Server platform replacing 'FROM' in column names during limit

- added test for getListTableColumnsSQL
- added test for getListTableForeignKeysSQL
- added test for getListTableIndexesSQL

Fixed a PHP warning in DBALException::driverExceptionDuringQuery() when a parameter contains binary data.

Fix for DBAL-442

[DBAL-54] [DBAL-420] Cannot drop schema using IDENTITY strategy in PostgreSQL

fix named_token

Add Symfony Console dependency to composer.json

    Connection#insert(),  Connection#update() and Connection#delete(). Closes GH-271