Special handling for "single custom" uploads is an abomination

In various places in the Soyuz code, we have special magic handling for any upload which only contains a single custom file.

This is ridiculous; handling should be on the basis of the types of custom uploads, or on other information about the file (such as who uploaded it, which door to Soyuz it came through, etc., which we don't directly store at the moment).

Depending on the fact that, with current policy, only a certain type of upload has this file count, is a timebomb - what if we change the policy? What if we introduce another new type of custom upload and it doesn't want this special magic handling?

I feel dirty. I'm going to go shower.