Add several minor experiment_stats fields; swap_errors (a count),
swap_exitcode (last error), idle_swaps (a count), batch (a flag to indicate a batch experiment). Add a operational log. Okay, its not actually a log, but a table that will grow forever until it consumes the earth. Its a small table though, so it will take a few years. Its cross indexed with the experiment_stats table, so by massaging this table along with the stats table, we can get a good picture of what was running on the testbed when, and how many resources it was using. Sorry, not a log file, but we can easily generate a log file from tbe table if the Boss really wants one. The table entry averages 28 bytes. Move stats to their own main menu item (admin mode only). Remove from the showexp_list page since that was bogus.
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