Fixed generated sql for postgres substring function

Remove unnecessary code from Connection::insert

Shard description requires an 'id' not 'name'

Update lib/Doctrine/DBAL/Types/BlobType.php

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.