Updated OCI8Connection parameter name in order to separate oracle pooling handling with oci8 persistent connections

Adding PDO::FETCH_COLUMN support to OCI8 fetchAll method using the fetch structure OCI_FETCHSTATEMENT_BY_COLUMN.

This enables a more natural way of interacting with result sets,
and re-introduces in Doctrine DBAL a feature that has been available
in PDO from the begining.

Fix bug where empty or null host connection parameter will still construct an Oracle DSN instead of using dbname.

Patch for OCI8Statement to support param[0] being null. Switched isset to array_key_exists. Added test that demonstrates the bug and confirms the fix.

to be able to make OCI8 derived classes

DBAL-22 - Fix DateTime with Timezone handling in Postgres and Oracle by introducing new type DateTimeTz and have SchemaManagers of both platforms detect this type. Added general conversion testcase which made some bugs in Oracle Date Handling and $stmt->fetchColumn() appear

Revertd partially the support to DBAL\Transaction, it was wrong. Fixed implementation of ORM\EntityTransaction and fixed tests.

Fixed svn dependency in build file and some weird issues where the oci8 driver loses spaces in the sql while transforming positional to named parameters.

[2.0][DDC-354][DDC-425] Fixed. Encapsulated SQL logging better in the DBAL. Added binding types to DBAL mapping types as well as using these binding types in the persisters. Query and NativeQuery now support PDO binding types as well as DBAL mapping types when binding parameters.