This appears to fix the "lots of user.dat files open concurrently" behavior that remains when a browser/client has the webv4 page open for a long
Eventually, the User objects created in this loop would be cleaned (and the user.dat file descriptors closed), but the default garbage collection interval (configurable) is 1000 calls to the CommonOperationCallback function. This could
be as as long as 1000 times through this loop before GC occurs.
Since this is not a performance sensitive loop (we have a call to sleep for a full second) just force a garbage collection for each loop iteration.
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