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- No longer use the Fibonacci sequence for delaying the timeout.
  It is too aggressive.
- The backoff_timer AMD module now expects the callback AND the
  backoff function to be passed to the constructor.
- Added ability to specify polling frequency in config.php.
- Added helper function to return the cache key.
- Reworded the parameters for clarity.

1. getMock()
2. setExpectedException()
3. checkForUnintentionallyCoveredCode renamed to beStrictAboutCoversAnnotation
4. beStrictAboutTestSize renamed to enforceTimeLimit
5. UnitTestCase class is now fully removed.

This finally allows us to type only the class name when executing individual core test cases.

Was breaking unit tests.

This reverts commit 61a73b43 and 7bb19ee1.

We have fixed the returning of the guest user now

When code executed in test cases is using/preventing
database transactions, phpunit itself cannot
use transactions for reseting between cases. But we
can tell it about, so some alternative (and slower)
method for reseting will be used.