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

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

Fixing issue when number of positional parameters != number of given types

Improve list SQL Server table indexes

Fix SQL Server default constraints

Fix list SQL Server composite foreign keys

Allow removing column comment on some platforms

Fix ModifyLimitQueryTest