Add support for idleswapping an experiment as the creator of the
experiment, rather than as an administrator, which presents group permission problems when the experiment is in a subgroup (requires two additional group, whereas suexec adds only one group). That aside, the correct approach is to run the swap as the creator. To do that, must flip to the user (from the admin person) in the backend using the new idleswap script, and then run the normal swapexp. Add new option to swapexp (-i) which changes the email slightly to make it clear that the experiment was idleswapped, and so that the From: is tbops not the user (again, to make it more clear).