Repaired the usage of ``.prepare()`` in conjunction with

cx_Oracle so that a return value of ``False`` will result
in no call to ``connection.commit()``, hence avoiding
"no transaction" errors.   Two-phase transactions have
now been shown to work in a rudimental fashion with
SQLAlchemy and cx_oracle, however are subject to caveats
observed with the driver; check the documentation
for details.  Also in 0.7.10.
[ticket:2611]

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