Comment 8 for bug 646124

We discussed this issue on IRC, a summary:
 * the current definition of LeastRecentActors is wrong, it should be "application I have not used for the longest time"
 * we need a new ResultType for the old definition ("The first event of each different actor"), something like OldestActor

The plan to fix this bug is:
 1.) Fix the initial issue described in bug 641968 (LeastRecentActors is not working together with templates)
 2.) land the fix for 1.) in lp:zeitgeist
 3.) rename LeastRecentActor into something like OldestActor (we still need a smart name for this)
 4.) reimplement LeastRecentActor to return the result as descibed in the various examples here
 5.) land 3.) and 4.) to lp:zeitgeist at the same time