also refactors URL path evaluation into smaller methods

fixes #1106

When creating sqlite connections from a url with DriverManager, pass the 'path' key the driver expects instead of the 'dbname' key other drivers expect.

tests to come

- Fixed docblocks
- Removed return statements on void methods
- Cleaned up unused private / local variables
- Fixed license issues
- Removed SVN leftovers
- Fixed doctrine-project.org links
- Added line breaks before return statements

This is necessary because pdo_sqlsrv still has some little bugs that
prevent it from being used in all use-cases. Additionally only sqlsrv
can make use of the Azure federations features.

Signed-off-by: Juozas Kaziukenas <juozas@juokaz.com>

Removed EntityTransaction until it has a real purpose. Added the affected entity to OptimisticLockException. Updated functional optimistic locking tests accordingly.

DDC-496 Finished first versions of platform and schema manager for DB2, DDC-528 Added support for PDO_IBM driver, passing all but 3 tests that are related to CLOB fields

[2.0][DDC-284] Fixed. API polish and some convention over configuration simplifications for join columns and join tables.

[2.0] DDC-92 - Refactored Doctrine\DBAL\DriverManager some more in regards to exceptions and added some more test-cases.