Fix integer type mapping in SQL Anywhere 16

Fix driver error while introspecting sequences in SQL Server 2012

Don't return warnings as errors in sqlsrv driver

This reverts commit 5a46f577.

Fix more occurances of the extending Test bug, "reactivating" a total of 200 tests. SQLAnywhere is missing and is a bit more annyoing to fix, because of a deep inheritance hierachy.

Fix some assertion and CS in schema manager functional tests

Implement ExceptionConverterDriver in Oracle drivers

Fix parsing SQL Server bracket delimiters in SQL statements

Add missing driver exception subclasses

Fix Oracle test suite

[DBAL-558] Fix parsing parameters in quoted text with backslash

[DBAL-234] [DBAL-566] Add support for renaming indexes