Fix bug with respect to modified experiments that abort and get
swapped out (non-recoverable) by tbswap. swapexp was leaving the experiment in the running state instead of paused. We need to check this after tbswap since we do not get reasonable error codes back. Also some cleanup with respect to how aborted modifies are handled. I think I understand what Chad did ... A general comment; we need to be better about returning meaningful error codes!
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