Added support for savepoints.
Call commit/rollback even for unmodified foreign tables.
Fixed typo in the testfdw class.
Updated the Python 3.3 tests to reflect the new transaction hooks.
Updated the Python 2.7 tests to reflect the new transaction hooks.
The sub_commit/sub_rollback routines should be called only at the current depth.
Added tests for the savepoints hooks.
Some test cleanup.
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Fix test with savepoints
Fix tests from master.
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