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.

This reverts commit 0d2af886, reversing
changes made to eb0a4615.

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.

[2.0] DDC-197 - Fix for OCI8 returning CLOBs as OCI-LOB instances, was it that easy? The test suggets that inserting clobs is not even requiring the temporary syntax anymore.. Great!