Automatic retry mechanism is incompatible with the Theories runner

[sbabcoc]

Enabling automatic retry with tests that are parameterized with the Theories runner results in bad behavior. The solution is to factor out the core of RetryHandler.runChildWithRetry(), passing in the statement that gets stashed away by the "theory catalyst" of the MethodBlock class. This will fix the incompatibility, and will also eliminate a bunch of redundant code in the RunWithCompleteAssignment class.

Note that the RunChild interceptor must be cognizant of the Theories runner, foregoing redirection of execution to the retry handle at this point to avoid attempting to retry the entire set of method permutations.

[sbabcoc]

The problems ran deeper than the Theories runner.