#4 Transaction Rollback causes spurious unlock

[Marco Von Ballmoos]

In v.61, When Rollback is called on the connection, it still
calls Unlock, even though the StartTransaction method
no longer calls the corresponding Lock. Commit no
longer calls Unlock, but Rollback still does.

Removing the Unlock from Rollback fixes the problem

[René Tegel]

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Typical 'oops'.. will be fixed in 0.62. Tx!