Changed 'implements' by 'extends' because AbstractSchemaSynchronizer is a class not an interface (and Eclipse PDT shows a warning that say that "The type SQLAzureFederationsSynchronizer must implement the inherited method processSqlSafely, processSql" but those methods are already implemented on AbstractSchemaSynchronizer).

Unsigned column properties were never set. In consequence all migrations diff were trying to change the column definition when it was already changed.

previous changes in bindparam function

bindParam function expects length parameter for oci_bind_by_name oci8

This reverts commit 17a265d9.

driver function

Fix DebugStack->stopQuery to prevent unnecessary timings when disabled.