[ZendTo] Duplicate dropoff id

[Artyom Aleksandrov]

Hi, I migrated my zento installation from Ubuntu 8.04 to 12.04 and caught
disgusting bug.
Time to time when someone create new dropoff his/her files are including to
already exist dropoff. And on dropoff summary page we can see old dropoff
with download statistic  and old/new files.

It looks like "Did" (dropoff id) is not unique and there isn't check for it.
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