Check Present attribute on cached data

Well, we cannot cache the Present attribute, because it can change
without our knowledge, when a movie file has been archived in the
meantime. Leave it in CachedFileData for now, but check it when we found
a cache entry.

While working on this, I realized that the Origin attribute is pretty
much useless, at least in its current form. countMd5() already checks
the origin table, and everything else was guesswork on the filename.
Also, it was an extra, quite expensive SQL-Query for every video file,
so remove it.

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