Avoid database reentrancy issue during parallel testing #1683
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Ava's parallel test execution was causing some of the swingset-runner tests to intermittently step on each other's database state, resulting in test flakiness. Tests now run with each using its own temporary database file.
To achieve this swingset-runner has acquired a command line option to let you put the database someplace other than the default location for the swingset, which might be useful in other circumstances too.